Физика список научных статей
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Anomalous 141Pr nuclear magnetic relaxation in PrF3 Van Vleck paramagnet
The magnetic nuclear spin-lattice relaxation has been studied in PrF3. It was found that 141Pr spin-lattice relaxation rate is untypically high for the Van Vleck insulator. According to all existing experimental data the only relaxation channel for enhanced nuclear moments at low temperatures is...
2019 / A. S. Aleksandrov, A. V. Egorov, S. L. Korableva, M. S. TagirovWOSScopus
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Decay of multiple quantum NMR coherences in quasi-one-dimensional chains in calcium fluorapatite
Multiple quantum (MQ) nuclear magnetic resonance (NMR) experiment is considered on chains of fluorine atoms in calcium fluorapatite. The second moments of the line shapes of the MQ coherences on the evolution period of the MQ NMR experiment are calculated analytically in the approximation of...
2019 / G. A. Bochkin, E B. Fel’dman, I. D. Lazarev, S G. Vasil’ev, V. I. VolkovWOSScopus -
Contributions of different parts of dipole-dipole interactions to relaxation of multiple quantum NMR coherences in a single crystal of calcium fluorapatite
Dipolar relaxation of multiple quantum (MQ) nuclear magnetic resonance (NMR) coherences on the evolution period of the MQ NMR experiment is investigated experimentally and theoretically in a single crystal of calcium fluorapatite. The theoretical approach is based on the zz model when the flip-flop ...
2019 / G. A. Bochkin, E B. Fel’dman, I. D. Lazarev, S G. Vasil’evWOSScopus -
Size effect for asphaltene particles in the resin by NMR
The resin-asphaltene model systems with different sizes of asphaltenes are studied by nuclear magnetic resonance (NMR) using the solid-echo sequence. For systems with particle sizes of asphaltenes greater than 50 μm, the form of relaxation attenuation consists of two components, one of which is...
2019 / D. S. Ivanov, E. E. Barskaya, V. D. SkirdaWOSScopus -
The processes of aggregation and dissolution in model systems resin-asphaltene by NMR
The resin-asphaltene model samples are studied by nuclear magnetic resonance (NMR). According to the differences in spin-spin relaxation times, we are able to distinguish two components of the resin in the mixture. The first component with slower relaxation rate corresponds to the resin in bulk....
2019 / D. S. Ivanov, E. E. Barskaya, V. D. SkirdaWOSScopus -
Influence of structure effects and orbital ordering on the magnetic hyperfine field in pyrochlore oxides R2V2O7 (R = Lu, Yb, Tm, Er, Ho): ab initio calculations
The detailed ab initio calculations of crystal structure and hyperfine interaction parameters are presented for R2V2O7 system (R = Ho, Er, Tm, Yb, Lu) to investigate the effect of the V-ion environment due to R-ion substitution on the local magnetic properties of 51V nucleus. It is shown that this...
2019 / P. A. AgzamovaWOSScopus -
FMR line shape effect on spin pumping in bilayer structures
Pure spin current induced by ferromagnetic resonance (FMR) excitation in thin-film heterostructures consisting of ferromagnetic (FM) and normal metal (NM) layers is studied as a function of FMR line shape and width. Experiments were carried out with thin films of ferromagnetic La2/3Sr1/3MnO3 (LSMO) ...
2019 / V. A. Atsarkin, V. V. Demidov, T. A. Shaikhulov, G. A. Ovsyannikov, V A. Kotel’nikovWOSScopus -
Magnetoelectric coupling in noncollinear ferrimagnets
The analytical expressions for the energy coupling of exchange coupled spins with electric field, induced by odd crystal field has been derived in the third order perturbation theory, combining the action of electric field, spin-orbit and exchange interactions. The magnetoelectric coupling due to...
2019 / M. V. EreminWOSScopus -
Superconducting spin-valves in spintronics
A brief review of investigations carried out in recent years by teams of the Laboratory of Physics of Magnetic Nanostructures and Spintronics and the Laboratory of the Synthesis and Analysis of Thin-Film Systems is presented.
2019 / R. R. Gaifullin, R. G. Deminov, M. N. Aliyev, L. R. TagirovWOSScopus -
Fluctuations of various order parameters in cuprate and Fe-based superconductors as revealed by microwave absorption measurements
Fluctuations of various order parameters are considered as the significant components of understanding the mechanism of high-Tc superconductivity. To study these fluctuations in the cuprate and Fe-based superconductors we use the joint measurements of direct current resistivity and non-resonant...
2019 / I. I. Gimazov, Yu. I. Talanov, T. Adachi, T. Noji, Y. Koike, K. Omori, Y. Tanabe, D. Chareev, A. VasilievWOSScopus -
Intrinsic spin resonance in iron pnictides
We report on ESR measurements in polycrystalline LaFeAsO and PrFeSbO and in single crystalline Mn-doped Ba(Fe0.975Mn0.025)2As2. The absorption spectrum can be described by a broad resonance line with Lorentzian lineshape. The intensity of the resonance absorption follows the temperature dependence...
2019 / H. -A. Krug Von Nidda, M. Hemmida, S. Kraus, N. Pascher, J. Deisenhofer, A. LoidlWOSScopus -
Effect of doping on the electronic properties of graphene
In the framework of a density functional theory, an ab initio calculation of a band structure of single-layer graphene doped by nitrogen atoms was carried out. It is established that structural and electronic properties of such systems are strongly influenced by a dopant concentration and its...
2019 / E. P. Sharin, K. V. EvseevWOSScopus -
Resonant magnetoresistance in double-barrier antiferromagnetic tunnel junction
Resonant tunneling is studied theoretically for the asymmetric double-barrier antiferromagnetic tunnel junction (DAMTJ) with a bias voltage is applied. In this nanostructure, the direction of magnetization of the middle ferromagnetic layer is parallel (antiparallel) to the direction of...
2019 / N. Kh. UseinovWOSScopus -
EPR of single Yb3+ ions in CsCdBr3 monocrystals
New measurements of EPR spectra in single crystals CsCdBr3:Yb3+ are presented. The lines due to pairs of Yb3+ ions and single Yb3+ ions are observed. The spectra indicate the existence of several types of single Yb3+ paramagnetic centers. Resolved superhyperfine structure of some lines of these...
2019 / L. K. Aminov, M. R. Gafurov, I. N. Kurkin, S. I. Nikitin, A. A. RodionovWOSScopus -
Dimer self-organization of 53Cr impurity ions in synthetic forsterite
Paramagnetic centers formed by isotopically pure impurity 53Cr ions in synthetic forsterite (Mg2SiO4) are studied by continuous wave electron paramagnetic resonance. It is shown that chromium ions substitute magnesium ions as single ion with nonlocal charge compensation and dimer associate formed...
2019 / A. S. Apreleva, A. A. Sukhanov, V. F. Tarasov, K. A. Subbotin, E. V. ZharikovWOSScopus -
Wideband EPR-spectroscopy of Y3Al5O12:Er3+, (Y0.9Lu0.1)3Al5O12:Er3+ and Y3Al5O12:Fe2+ crystals
Using an X-band EPR spectrometer and a submillimeter EPR spectrometer, Y3Al5O12 (YAG), (Y0.9 Lu0.1 )3 Al5 O12 (YLuAG) crystals with erbium and YAG with iron were investigated. In YAG:Er crystals the resonance transitions between ground and the first excited doublets in the frequency range 580-750...
2019 / H. R. Asatryan, G. S. Shakurov, A. G. Petrosyan, K. L. HovannesyanWOSScopus -
Quantum magnetism of single molecules and diluted rare-earth alloys
This paper is a short overview of the works performed with Boris Malkin in a friendly and fruitful collaboration which started fifteen years ago and will, hopefully, be continuing for as many years as possible. Dealing with quantum tunnelling and coherence in non-cooperative magnetic systems such...
2019 / B. BarbaraWOSScopus -
Advances of crystal field theory and exchange charge model
A short overview of the exchange charge model of crystal field is given. Several most important applications of the model to the calculations of the crystal field parameters, energy levels of impurity ions, parameters of the electron-vibrational interaction and transition intensities supported by...
2019 / M. G. Brik, N. M. Avram, C. N. AvramWOSScopus -
Phonon spectrum of Nd2Zr2O7 crystal: ab initio calculation
Crystal structure and phonon spectrum of rare-earth pyroclore oxide Nd2Zr2O7 were studied within the framework of density functional theory and MO LKAO approach. The calculations were performed by using hybrid functionals that take into account both local and nonlocal (at the Hartree-Fock...
2019 / V. A. ChernyshevWOSScopus -
Ferromagnetic resonance study of the epitaxial VN/Pd0.96Fe0.04 thin film heterostructure on MgO substrate
The paper reports on the ferromagnetic resonance (FMR) and magnetometry studies of the epitaxial superconductor/ferromagnet-type thin film heterostructure of VN/Pd0.96Fe0.06 on the (001)-oriented MgO substrate. Vanadium nitride layer was deposited by dc reactive magnetron sputtering of the V-target ...
2019 / A. Esmaeili, W. M. Mohammed, I. V. Yanilkin, A. I. Gumarov, I. R. Vakhitov, B. F. Gabbasov, A. G. Kiiamov, M. N. Aliyev, R. V. Yusupov, L. R. TagirovWOSScopus
