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Academic Journal

Source:Magnetic Resonance in Solids. 2017, Vol. 19 Issue 1, p1-11. 11p.

Abstract:The objects of investigation were samples of domanik formation rocks of Berezovskaya area of Romashkinskoye oil field. Content of Mn2+, SO3 -, SO2 - ions, vanadyl-ions and free radicals has been estimated with the X-band (9.43 GHz) electron paramagnetic resonance (EPR) spectroscopy. Composition of rock and extracted from it bitumen has been studied with methods of thermal analysis, X-ray-structural analysis and gas chromatography. Significant differences in mineralogical composition and content of organic matter were revealed in samples taken from adjacent intervals. Pyrolytic experiments have been conducted to simulate kerogen maturation and petroleum generation. The increasing number of free radicals was registered in all samples after pyrolysis in a hydrogen atmosphere at 350°C. A new organic free radical C350 was registered after pyrolysis. It is suggested that domanik source rocks have not fully realized their hydrocarbon generation potential. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Khalvashi, E. Kh.1 enver.khalvashi@bsu.edu.ge, Fokina, N. P.2, Elizbarashvili, M. O.3

Source:Magnetic Resonance in Solids. 2017, Vol. 19 Issue 1, p1-17. 17p.

Abstract:The angular and temperature dependencies of the electron paramagnetic resonance (EPR) linewidth in the weak constant field and of the relaxation rates measurable by the Gorter type experiments in zero constant magnetic field (Gorter RRs) are analytically investigated in magnetically concentrated paramagnets with the dominating exchange interaction. The consideration is restricted to the experiments, where the EPR linewidth is both anisotropic and linear over the temperature. It is suggested that under such conditions the EPR broadening is caused by the spin-lattice relaxation of the anisotropic interaction via the one-phonon mechanism. The analytical results are brought to the form suitable for the extraction of the Dzyaloshinsky-Moriya and the crystal field interaction constants from the experiment. It is shown that the EPR linewidth at the constant field direction along any crystal axis is equal to the half sum of the zero-field RRs for the two other crystal axes. The obtained results are successfully used for the interpretation of the EPR experimental results in the La0.875Sr0.125MnO3 and La0.875Sr0.125MnO3 single crystals in the Jahn-Teller strongly distorted phase in the definite temperature interval. The angular dependencies of the Gorter RRs and the EPR linewidth are presented graphically at the constant field continuous rotations in the three crystallographic planes in La0.875Sr0.125MnO3. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-4. 4p.

Abstract:This article provides suggestions and ideas on the use of magnetic observatories to observe the stability of the gyromagnetic ratio of the proton and the electron in order to detect the effects of new fundamental physics and cosmology. The idea consist in long continuous recording of the signals Overhauser and optical pumping K magnetometers. Such systems can be highly effective network for forecasting earthquakes due to highest long term sensitivity. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-9. 9p.

Abstract:This paper covers same results of the research directed at developing an absolute vector proton magnetometer POS-4 based on the switching bias magnetic fields methods. Due to the high absolute precision and stability magnetometer POS-4 found application not only for observatories and to directional drilling support of oi and gas well. Also we discuss the some basic errors of measurements and discuss the long-term experience in the testing of magnetic observatories ART and PARATUNKA. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Vorobeva, V. E.1,2, Domracheva, N. E.1 ndomracheva@gmail.com, Gruzdev, M. S.3

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-4. 4p.

Abstract:The superparamagnetic γ-Fe2O3 nanoparticles (average diameter of 2.5 nm) encapsulated in poly(propylene imine) dendrimer have been investigated by electron magnetic resonance (EMR). EMR measurements have been recorded in perpendicular and parallel configurations in the wide temperature range (4.2-300 K). It has been shown that the model based on the spin value S = 30, corresponding to the total magnetic moment of the nanoparticle, can be used to interpret the experimental results and the proof of the quantum behavior of γ-Fe2O3 nanoparticles. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-8. 8p.

Abstract:A rhombohedral layered α-NaFeO2-type compound, Lix[Ni(1+x)/3Sb(2-x)/3]O2 (x = 0.8) has been prepared from the sodium analogue by ion exchange at 570 K. In contrast to the stoichiometric composition Li3Ni2SbO6, it shows considerable Li/Ni inversion and no long-range Ni/Sb ordering. The temperature dependence of the 7Li NMR spin-lattice relaxation rate and linewidth data measured at temperature range from 30-450 K show the sharp increase of lithium ions mobility comparing to the stoichiometric compound Li3Ni2SbO6. From the NMR data the activation energy was estimated by different methods. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Shafikov, F. F.1, Savinkov, A. V.1 Andrey.Savinkov@gmail.com, Tagirov, M. S.1,2

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-5. 5p.

Abstract:The crystal field analysis based on calculations in the framework of the semi phenomenological exchange charge model was carried out. The set of crystal field parameters for Ce3+ and Pr3+ ions in the matrix CeF3 related to the crystallographic system of coordinates has been obtained and used to reproduce satisfactory the crystal field energies of Ce3+ and Pr3+ ions. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Nuzhina, D. S.1, Romanova, I. V.1 romanova.irina.vladimirovna@gmail.com

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-10. 10p.

Abstract:The Hamiltonian of the magnetic subsystem containing rare-earth ions involves energies of the localized 4f-electrons in free ions, energies of interactions of the 4f-electrons with the static crystal field in the perfect crystal lattice as well as in the homogeneously deformed lattice, interactions with the external magnetic field and lattice vibrations (electron-phonon interaction), magnetic dipolar and exchange interactions between the ions. This Hamiltonian is used in calculations of different measurable physical parameters versus temperature and the magnetic field strength and direction (energy levels of rare earth ions, the magnetization, magnetic dc- and ac-susceptibilities, elastic constants, lattice deformations). [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-6. 6p.

Abstract:Samples LiTbF4 and TbF3 were synthesized by modified methods of colloidal chemistry. The magnetization of these samples was measured in the external magnetic field at 100 Oe and 1T and in temperature range 2-300 K. Temperatures of phase transition to the magnetic ordering dipolar ferromagnet state were determined for synthesized samples. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-5. 5p.

Abstract:The superconducting uctuations above critical temperature in the Bi2Sr2Ca1-xYxCu2O8 single crystals are studied. The boundaries of the superconducting uctuations area are defined by the MWA measurement. The estimation of the uctuations lifetimes is made. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Bochkin, G. A.1 bochkin.g@yandex.ru, Fel'dman, E. B.1, Vasil'ev, S. G.1

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-6. 6p.

Abstract:Experimental and theoretical investigations of dynamics and relaxation of multiple quantum (MQ) nuclear magnetic resonance (NMR) coherences of the zeroth and second orders are performed in a quasi-one-dimensional chain of nuclear spins of 19F in calcium uorapatite. MQ NMR dynamics are studied on the preparation period of the MQ NMR experiment in the approximation of nearest neighbor interactions. The density matrix of the system at the end of the preparation period is used as the initial condition for the study of the relaxation process on the evolution period of the MQ NMR experiment. The relaxation asymptotics of the intensity of the MQ NMR co-herence of the zeroth order is obtained. Relaxation of the MQ NMR co-herence of the second order is investigated with ZZ part of the dipole-dipole interactions. The experimental data qualitatively agree with the results of the developed theory. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Dzheparov, F. S.1 dzheparov@itep.ru, Lvov, D. V.2 lvov@itep.ru

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 2, p1-8. 8p.

Abstract:Famous Anderson-Weiss-Kubo model of magnetic resonance is reconsidered in order to bridge existing gaps in its applications for solutions of fundamental problems of spin dynamics and theory of master equations. The model considers the local field fluctuations as one-dimensional normal random process. We refined the conditions of applicability of perturbation theory to calculate the spin depolarization. It is shown that for very slow fluctuations the behavior of the longitudinal magnetization is simply related to the correlation function of the local field. The effect could be checked by the experimental studies of magnetic resonance in quasi-Ising paramagnets. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 1, p1-5. 5p.

Abstract:[Fe(3-MeO-Qsal)2]Y (Y = PF6, BF4, NCS, NO3, BPh4) compounds were synthesized using the diffusion method and studied by the electron spin resonance and the magnetic susceptibility methods in the temperature range (5-300) K. Coexistence of spatially separated high-spin and low-spin fractions in these compounds was observed. Low-spin fraction of all compounds reveals the antiferromagnetic correlations at low temperatures. High-spin fraction of complexes with Y = PF6 demonstrate the weak ferromagnetic properties due to exchange interaction between complexes in whole temperature range. Influence of outer-sphere anion on the spin state, the electronic properties of low-spin Fe(III) complexes is demonstrated. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 1, p1-5. 5p.

Abstract:We report the observation of pulsed electron-nuclear double resonance (ENDOR) spectrum caused by interactions of the nitrogen nuclei 14N with the unpaired electron of the paramagnetic vanadyl complexes VO2+ of vanadyl porphyrins in natural crude oil. We provide detailed experimental and theoretical characterization of the nitrogen hyperfine and quadrupole tensors. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2016, Vol. 18 Issue 1, p1-7. 7p.

Abstract:Changes of paramagnetic centers (PC) concentration in dispersed petroleum systems were studied in the process of low-temperature thermolysis. The kinetic model of PC concentration dynamics based on the processes of unpaired electrons formation during singlet-triplet transitions, weak chemical bonds dissociation and recombination of free radicals is proposed. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 2, p1-4. 4p.

Abstract:Results of demagnetizing effect studies in yttrium iron garnet Y3Fe5O12 thin films are reported. Experiments were performed on X-Band of electron paramagnetic resonance spectrometer at room temperature. The ferromagnetic resonance (FMR) spectra were obtained for one-layer single crystal YIG films for different values of the applied microwave power. Nonlinear FMR spectra transformation by the microwave power increasing in various directions of magnetic field sweep was observed. It is explained by the influence of the demagnetization action of nonequilibrium magnons. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Kondratyeva, E. I.1,2 katarina.kondratyeva@gmail.com, Safiullin, K. R.1,2, Motygullin, I. G.1, Klochkov, A. V.1,2, Tagirov, M. S.1,2, Kuzmin, V. V.1

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 2, p1-8. 8p.

Abstract:The effect of the heat treatment duration on the electron paramagnetic resonance signal amplitude of free radicals for various wood species was observed. It was found that the amplitude of the electron paramagnetic resonance signal grows linearly with the vacuum heat treatment duration. The quantitative measurements of color changes for various wood species (pine, spruce, larch, birch and small-leaved lime) were performed. It is found that results of EPR experiments and color measurements of heat treated samples correlate with each other. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Gimazov, I. I.1 ubvfp94@mail.ru, Talanov, Yu. I.2

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 2, p1-6. 6p.

Abstract:The results of the electron spin resonance study of the La1-xCaxMnO3 manganite and the diphenyl-picrylhydrazyl thin films for the magnetic field parallel and perpendicular to plane of the films are presented. The temperature dependence of the demagnetizing field is obtained. The parameters of the Curie-Weiss law are estimated for the paramagnetic thin film. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 2, p1-5. 5p.

Abstract:Results of experiments on MnCO3 investigations by double magnetic resonance are presented. Additional mode of oscillation has been observed in a created Bose-Einstein condensation of magnons state in MnCO3. The properties of observed signals are similar to Goldstone modes. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Balakirev, N. A.1, Zhikharev, V. A.1 valzhik@mail.ru

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 2, p1-6. 6p.

Abstract:The computer simulation of the formation of 2D magnetic cluster is performed. It is shown that the magnetic interaction between growing cluster and randomly walking atoms results in the cluster elongation in the cluster magnetization direction. The features of microwave field absorption (FMR or SPR signals) in thin granular film consisting of elongated clusters are discussed. Magnetic resonance measurements can provide the detailed information on shape anisotropy of the particles and give an evidence for considered model of magnetic cluster growth. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Belov, S. I.1 Sergei.Belov@kpfu.ru, Kutuzov, A. S.1

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 1, p1-9. 9p.

Abstract:We present a theoretical model to describe unusual properties of Kondo lattices. The influence of the Kondo effect on the static magnetic susceptibility and electron spin resonance (ESR) parameters is studied in a simple molecular field approximation together with a scaling perturbative approach. Theoretical expressions well agree with the ESR and static magnetic susceptibility experimental data. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Solovyev, O. V.1 Oleg.Solovyev@mail.ru

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 1, p1-8. 8p.

Abstract:Analytical expressions are obtained for g-factors of the ground Kramers doublet of the impurity Ce3+ ions in LiYF4 crystal that rigorously take into account mixing of the 2F5/2 and 2F7/2 multiplets by crystal field. Dependence of g-factors on crystal field parameters is studied and possibilities of making conclusions about crystal filed parameters values on the basis of comparison with g-factors given in literature are considered. [ABSTRACT FROM AUTHOR]

:Copyright of Magnetic Resonance in Solids is the property of Magnetic Resonance in Solids, Electronic Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Academic Journal

Authors:Anikeenok, O. A.1 Oleg.Anikeenok@kpfu.ru

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 1, p1-5. 5p.

Abstract:Expressions for the calculation of the Fourier transform of the direct Coulomb interaction of electrons have been derived in the method of strong bond. It was shown that in the elaborated method it is not necessary to spread out nuclear charges over the crystal as it is done in the case of delocalized electrons. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Yavkin, B. V.1 boris.yavkin@gmail.com, Mamin, G. V.1, Gafurov, M. R.1, Orlinskii, S. B.1

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 1, p1-7. 7p.

Abstract:Size-calibrated commercial nanodiamonds synthesized by high-pressure high-temperature (HPHT) technique were studied by high-frequency W- and conventional X-band electron paramagnetic resonance (EPR) spectroscopy. The numbers of spins in the studied samples were estimated. The coreshell model of the HPHT nanodiamonds was proposed to explain the observed dependence of the concentration of the N0 paramagnetic centers. Two other observed paramagnetic centers are attributed to the two types of structures in the nanodiamond shell. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 3, p1-4. 4p.

Abstract:Elementary excitations in antiferromagnets are magnons, and these quasiparticles with integer spin are governed by Bose statistics. In certain conditions their density can be controlled by applied radiofrequency pulse leading to the formation of Bose-Einstein condensation (BEC). We report the investigations of free induction decay signal duration in CsMnF3 under different conditions and discuss it in the framework of the magnon BEC. The observed results in CsMnF3 and previous investigations in superfluid 3He-A are compared. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Seemann, K.1 klaus.seemann@kit.edu, Leiste, H.1, Krüger, K.

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 3, p1-5. 5p.

Abstract:In order to establish an expression for the ferromagnetic resonance frequency of specimen with general shape, the Landau-Lifschitz-Gilbert differential equation was solved by considering demagnetisation effects and damping. By beginning the approach of calculation in a three dimensional space the sample was regarded as a uniformly magnetised ferro- or ferrimagnetic conventional ellipsoid. The condition for calculation must be a one-domain state which can be obtained by introducing a marked uniaxial anisotropy field and/or by applying an external magnetic saturation field. This can now be put on the level with a macro-spin precessing about its preferred direction. As a result, a more exact solution for the ferromagnetic resonance frequency was achieved which takes the phenomenological damping parameter as well as the demagnetisation factors into account. Applying it to certain sample shapes (plane, spherical or cylindrical) the uniaxial anisotropy field, the saturation magnetisation and especially the damping parameter show a different impact on the resonance frequency value. It could be shown that a plane sample (film) is more influenced by the damping parameter. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Schmidt, B.1, Krug von Nidda, H. -A.1 kvn@physik.uni-augsburg.de, Riegg, S.1, Ebbinghaus, S. G.2, Reller, A.3, Loidl, A.1

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-10. 10p.

Abstract:LaCu3RuxTi4-xO12 undergoes a metal-to-insulator transition (MIT) from a heavy-fermion metal (x = 4) with moderately enhanced electronic masses to an antiferromagnetic insulator (x = 0) with colossal dielectric constants. So far, the exact value xc of the MIT could not be obtained from electrical resistivity or specific-heat data, which are governed by local-moment scattering and Schottky anomalies, respectively. To investigate the MIT by electron spin resonance (ESR) technique, polycrystalline samples of the solid-solution series La1-yGdyCu3RuxTi4-xO12 were synthesized for the substitution range 1 ≤ x ≤ 4 and 0.05 ≤ y ≤ 0.15, where Gd3+ (8S7/2 ground state) serves as ESR probe. For x = 4 the Gd3+ ESR linewidth exhibits an enhanced Korringa relaxation at low temperatures (T < 50 K) as typically expected for heavy-fermion metals. This metallic contribution gradually diminishes on decreasing Ru content x and vanishes for x = 2.25 localizing the MIT close to the onset of spin-glass behavior arising for x ≤ 2. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Deminov, R. G.1 Raphael.Deminov@kpfu.ru, Useinov, N. Kh.1, Tagirov, L. R.1

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-9. 9p.

Abstract:This paper is a brief review of investigations, which were carried out during last years by team of magnetic nanostructures and spintronics laboratory, and is dedicated to the 80th anniversary of our Teacher - professor B.I. Kochelaev. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-14. 14p.

Abstract:Review of our recent results concerning the spin valve effect are presented. Using the spin switch design F1/F2/S proposed theoretically that comprises a ferromagnetic bilayer (F1/F2) as a ferromagnetic component, and an ordinary superconductor (S) as the second interface component, we have realized for the first time a full spin switch effect for the superconducting current. For CoOx/Fe1/Cu/Fe2/In multilayered systems with varying Fe2-layer thickness we observed the sign-changing oscillating behavior of the spin valve effect ΔTc = TAPc - TPc (here TAPc and TPc are the superconducting transition temperatures for antiparallel and parallel orientations of magnetizations of the F1 and F2 layers, respectively). We have also studied the angular dependence of Tc for the spin valve system CoOx/Fe1/Cu/Fe2/Pb. We found that this dependence is nonmonotonic when passing from the parallel to the antiparallel case of mutual orientation of magnetizations of the Fe1 and Fe2 layers and reveals a distinct minimum near the orthogonal configuration. The analysis of the data in the framework of the superconducting triplet spin valve theory gives direct evidence for the long-range triplet superconductivity arising due to noncollinearity of the two magnetizations. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Andronenko, S. I.1 sergey.andronenko@gmail.com

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-5. 5p.

Abstract:Role of bottlenecked spin relaxation and proportionality between small polaron hopping conductivity and electron paramagnetic resonance (EPR) linewidth (intensity) was emphasized. This idea gave a background for several experimental and theoretical investigations and it was starting point for its further generalization on variable range hopping conductivity and its influence on EPR linewidth in rare earth manganites. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Eremin, M. V.1 meremin@kpfu.ru, Shigapov, I. M.1, Eremin, I. M.1,2

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-21. 21p.

Abstract:We derive the dynamical spin susceptibility in the t-J-G model combining the random phase approximation (RPA) and projection operator method, which allows describing the mutual interplay between the local and the itinerant components of susceptibility. Near the antiferromagnetic wave vector the calculated dispersion of the spin excitations reproduces well the so-called hour-glass dispersion, characteristic for several layered cuprates. It is formed as a result of competition between the original spin-gap in magnon-like excitations spectrum and the superconducting gap, which affects the itinerant component of the susceptibility. Further- more, the calculated collective spin excitations along (0, 0)-(0, π) are in agreement with the positions of the absorption peaks in the inelastic X-ray scattering spectra. They refer to the paramagnon-like modes, characteristic to the itinerant spin system, rather than magnon-like excitations that originate from short range order effect in the system of local spins at Cu sites. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Maisuradze, A.1, Shengelaya, A.2 alexander.shengelaya@tsu.ge, Pomjakushina, E.3, Conder, K.3, Keller, H.1, Müller, K. A.1

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-6. 6p.

Abstract:The relaxation of Yb3+ in YBa2Cu3Ox (x = 6.1 and 6.4) was studied using Electron Paramagnetic Resonance (EPR). In these samples the Yb3+ relaxation is dominated by a phonon mechanism. It was shown that the conventional Raman two-phonon process involving acoustic phonons can not describe the temperature dependence of the Yb3+ relaxation. Instead, the Raman process involving optical phonons or an Orbach-like process via the excited vibronic levels of Cu2+ ions with energy Ω= 500(50)K is responsible for the phononic part of the Yb3+ relaxation in YBa2Cu3Ox. The present results provide clear experimental evidence that optical phonons or local vibrations are the dominant source of spin-lattice relaxation at sufficiently high temperatures, which cannot be described by the traditional approach using the Debye approximation. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Sharin, E. P.1 ep.sharin@s-vfu.ru

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-6. 6p.

Abstract:Within the framework of the London model the distribution of local magnetic field near the surface of plate of anisotropic type-II superconductor is found when the external magnetic field is perpendicular to the axis of symmetry of the crystal. There is obtained the distribution of the local magnetic field depending on the distance to the surface of the superconducting plate. It is shown that the lineshape of distribution of local magnetic field near the surface changes considerably as compared with the distribution in the depth of massive superconductor. This change should be taken into account when interpreting experimental data on the observation of the local magnetic field in the near-surface region of massive superconductor and in thin superconducting films (thickness is less than the depth of penetration of the magnetic field in the superconductor). [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Nigmatullin, R. R.1 renigmat@gmail.com, Rakhmatullin, R. M.1, Osokin, S. I.1

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-19. 19p.

Abstract:Is it possible to suggest a general theory for consideration of reproducible data that are measured in many experiments? One can prove that successive measurements have a memory and this important fact allows separate all data on two large classes: ideal experiments without memory and experiments with a memory. We introduce the concept of an intermediate model (IM) that helps to describe quantitatively a wide class of reproducible data. Experiments with memory require for their description the Prony's decomposition while experiments without memory are needed for their presentation the Fourier decomposition only. In other words, it means that a measured function extracted from reproducible data can have a universal description in the form of the amplitude-frequency response (AFR) that belongs to the generalized Prony's spectrum (GPS). It is shown also how real data distorted by the experimental equipment and how to eliminate these uncontrollable factors in order to reproduce approximately the conditions corresponding to ideal experiment. New and elegant solution of elimination of the apparatus (instrument) function is suggested. In an ideal case the decomposition coefficients belong to the Fourier transform and presentation of reproducible data in this form leads to the IM for this case. The suggested general algorithm allows considering many experiments from the unified point of view. The real example based on available electron paramagnetic resonance (EPR) data confirms this general concept. The unified "bridge" between the treated experimental data and a set of competitive hypothesis that pretend for their description is discussed. The results obtained in this paper help to put forward a new paradigm in data/signal processing. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Fatkullin, N. F.1 Nail.Fatkullin@kpfu.ru, Valiullin, R.2

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-7. 7p.

Abstract:The process of self-diffusion of particles confined to porous solids is studied for time intervals corresponding to particle displacements shorter than the characteristic pore size. The solid matrix is modeled as a (random) potential field with an infinitely large potential within the solid which decays to zero at distances of the order of a few particle sizes from the pore walls. Diffusion of particles in the thus created potential field is described by the Smoluchowski diffusion equation. It is shown that, for short diffusion times, the resulting equation for the time-depended diffusivity reproduces that earlier obtained in the literature [Mitra et al., Phys. Rev. Lett. 68, 3555 (1992)], but with the numerical constant differing by factor 2. The conditions under which this discrepancy arises are highlighted and discussed. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Atsarkin, V. A.1 atsarkin@cplire.ru, Demidov, V. V.1, Sorokin, B. V.1

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 2, p1-9. 9p.

Abstract:The resonance spin rectification (RSR) and resonance magnetoresistance (RMR) have been studied on La2/3Sr1/3MnO3 epitaxial thin films in the temperature range of 300 - 365 K, including the Curie point (TC). The RSR effect is found to be caused by anisotropic magnetoresistance under conditions of the magnetic-resonance microwave pumping; it decreases upon heating and disappears at TC. Unlike that, the RMR is maximal at TC and shows clear correlation with the colossal magnetoresistance (CMR) of the material under study. The interpretation implies decreasing of the sample magnetization due to resonance saturation, thus leading to an increase in electric resistivity in terms of the CMR mechanism. Quantitative agreement is demonstrated between the experimental RMR data and theory accounting for Bloch-type relaxation in the vicinity of the phase transition. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Tagirov, M. S.1 Murat.Tagirov@kpfu.ru, Zhikharev, V. A.2 valzhik@mail.ru

Source:Magnetic Resonance in Solids. 2015, Vol. 17 Issue 2, p1-3. 3p.

Geographic Terms:RUSSIA

Academic Journal

Authors:Belov, S. I.1 Sergei.Belov@kpfu.ru, Kutuzov, A. S.1

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 1, p1-7. 7p.

Abstract:We theoretically investigated the static magnetic susceptibility in the heavy fermion compounds YbRh2Si2 and YbIr2Si2. The molecular field approximation together with the renormalization of the Kondo interaction by the high energy conduction electrons excitations result in the Curie-Weiss law and Van Vleck susceptibility with temperature dependent Curie and Weiss parameters. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Eremina, R. M.1,2 REremina@yandex.ru

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 1, p1-8. 8p.

Abstract:We review some aspects of the electron paramagnetic resonance (EPR) studies in quasi-one-dimensional inorganic compounds with special emphasis on the angular dependencies of g-factors, linewidth and the information they reveal about the physical system. In particular, we employ for the analysis of the data the method of moments and outline the expressions for the second and the fourth moments which is related to different spin-spin interactions. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Anikeenok, O. A.1 Oleg.Anikeenok@kpfu.ru

Source:Magnetic Resonance in Solids. 2014, Vol. 16 Issue 1, p1-7. 7p.

Abstract:Parameters of the transferred hyperfine interactions (THFI) for O17: LaMnO3 have been estimated at room temperature. Satisfactory agreement with experiment has been obtained. [ABSTRACT FROM AUTHOR]

:Copyright of Magnetic Resonance in Solids is the property of Magnetic Resonance in Solids, Electronic Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Academic Journal

Source:Magnetic Resonance in Solids. 2013, Vol. 15 Issue 2, p1-9. 9p.

Abstract:In the present work we show with electron paramagnetic resonance (EPR) spectroscopy that in the process of the mechanochemical doping of the CaF2 fine particles with Er3+ and Yb3+ ions the cubic symmetry rare-earth (RE) ion centers are formed with the concentration proportional to the particles surface in the sample. Amount of the mechano-doped RE-ion centers is proportional to ηα , where η is the weight fraction of the RE fluoride in the initial mixture and α ∼ 0.8. Cubic symmetry centers dominate in the EPR spectrum up to η= 0.1. A hypothesis of the cubic RE-ion center formation is proposed according to which its origin is associated with the presence of the ideal cleavage planes in the CaF2 crystals: during the mechano-doping a considerable fraction of the rare-earth ions is trapped between the cleavage planes of the agglomerating particles, thereby getting into the crystal field of the cubic symmetry. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Blokhin, D. S.1, Berger, S.2, Klochkov, V. V.1 vklochko@kpfu.ru

Source:Magnetic Resonance in Solids. 2013, Vol. 15 Issue 2, p1-7. 7p.

Abstract:In the present paper the applicability of a structure determination for a four amino acid residues containing oligopeptide N-Ac-Ser-Phe-Val-Gly-OMe was investigated. The spatial structure of the "tetrapeptide (N-Ac-Ser-Phe-Val-Gly-OMe) - sodium dodecyl sulfate micelle" complex in aqueous solution was studied by 2D nuclear magnetic resonance (NMR) spectroscopy. The complexation was confirmed NOEs signs and values in the presence of sodium dodecyl sulfate. The spatial structure of the tetrapeptide in the complex was determined by 2D NOESY NMR spectroscopy. In present paper by the comparison 13C NMR chemical shifts was shown that tetra peptide's spatial structure in solid state and tetrapeptide structure in "peptide-micelle" complex are identical. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Savina, Yu.1 savina@ilt.kharkov.ua, Bludov, A.1, Pashchenko, V.1, Gnatchenko, S.1, Stepanov, A.2, Lemmens, P.3

Source:Magnetic Resonance in Solids. 2013, Vol. 15 Issue 2, p1-9. 9p.

Abstract:The angular and temperature dependences of single crystal ESR spectra at X-band frequency of quasi-1D spin 1/2 antiferromagnetic zigzag chain system β-TeVO4 are reported. Two resonance components in the ESR spectrum have been detected: a weak narrow resonance on the top of the extremely broad signal. The narrow line might be due to an impurity, the characteristics of the broad absorption do not correlate with a picture of the typical behavior for the V4+ ions (S = ½) with a square-pyramidal environment. It was found that at low temperatures the divergence of the spin susceptibility and linewidth of the observed excitations can be due to a realization of three-dimensional magnetic ordering. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2013, Vol. 15 Issue 1, p1-6. 6p.

Abstract:The home-built pulse nuclear magnetic resonance spectrometer for 3He research is described. The temperature range is 1.5 - 4.2 K, the frequency range is 3 - 20 MHz, the dead time is 10 μs at 10 MHz. The spectrometer software is based on programming language LabVIEW. The advantages of digital technique are described; particularly the implementation of digital quadrature detector. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Gafurov, M. R.1 Marat.Gafurov@kpfu.ru

Source:Magnetic Resonance in Solids. 2013, Vol. 15 Issue 1, p1-11. 11p.

Abstract:High-resolution proton NMR (400 MHz) and multifrequency EPR (9 - 260 GHz) characterization of aqueous solutions of the nitroxyl radical TEMPOL in the temperature range (10 - 40) °C is performed for the liquid-state DNP. Characteristic features of the in-situ DNP observations at high frequencies are presented. Optimal conditions (concentration, temperature, position of the microwave pumping, repetition/build-up time for the DNP experiments) are extracted. The results are compared with the DNP experiments, molecular dynamic calculations, saturation models, and classical models of translational and rotational diffusion. Perspectives for using TEMPOL as polarizing agent in even higher magnetic fields are discussed. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids. 2013, Vol. 15 Issue 1, p1-7. 7p.

Abstract:A series of nanosized (20 nm and larger) samples of hydroxyapatite powders synthesized by wet preparation method and doped with Mn2+ and Pb2+ ions were studied by 94 GHz pulsed electron paramagnetic resonance (EPR). The results are compared with those obtained in the samples of aorta walls from male patients with atherosclerosis as well as in bulk hydroxyapatite materials. It is shown that in contrast to bulk materials Pb ions at least partially replace the Ca(1) site in the hydroxyapatite structure. The spectral characteristics of the Mn2+ ions revealed in atherosclerotic plaque and synthetic hydroxyapatite are found to be practically identical. The hypothesis about the important role of (nano)hydroxyapatite in formation and rupture of atherosclerotic plaques is supported. [ABSTRACT FROM AUTHOR]

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Academic Journal

Authors:Orlova, A. Yu.1 AnnaYuOrlova@gmail.com, Gainov, R. R.1, Dooglav, A. V.1, Pen'kov, I. N.2

Source:Magnetic Resonance in Solids. 2013, Vol. 15 Issue 1, p1-7. 7p.

Abstract:Investigations of Sb-based chalcogenides, stephanite Ag5SbS4 and bournonite CuPbSbS3, have been performed by 121,123Sb nuclear quadrupole resonance (NQR). In stephanite a phase transition at 140 K and internal diffusion motions with an activation energy of 0.29 eV have been experimentally detected. The analysis of experimental results for bournonite revealed two crystal-chemical positions of Sb in the unit cell with distinct local symmetry. The NQR frequencies ? and line-widths ?? data indicate that Sb(A)S3 complex has almost axial symmetry, but Sb(B)S3 complex is substantially distorted. [ABSTRACT FROM AUTHOR]

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Academic Journal

Source:Magnetic Resonance in Solids, Vol 18, Iss 1, p 16104 (2016)

More Info:Paramagnetic properties of novel bioactive nanocomposite materials based on humic substances and the precious metals (Ag, Au) are investigated by electron paramagnetic resonance and compared to their antioxidant properties. The possible mechanisms of antioxidant activity in the light of the free radical activation or inhibition of oxidation processes are analyzed.

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