Физика список научных статей
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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 -
To the structure of the trigonal center of Yb3+ ion in hexagonal perovskite crystal RbMgF3
EPR and optical spectra are used for the analysis of distortions of a crystal lattice in the vicinity of an impurity ion Yb3+ of trigonal symmetry in RbMgF3 crystal. Within the framework of the superposition model, it is established that three F− ions of the nearest-neighboring octahedron, located...
2019 / A. M. LeushinWOSScopus -
The Lowdin orthogonalization and magnetoelectric coupling for noncentrosymmetric ions
The Lowdin orthogonalization procedure being the well-known technique, particularly in quantum chemistry, however, gives rise to novel effects missed in earlier studies. Making use of the technique of irreducible tensorial operators, we have developed a regular procedure for the account of the...
2019 / A. S. MoskvinWOSScopus -
High-resolution optical and EPR spectroscopy in solid-state research
A brief review is presented of high-resolution optical Fourier spectroscopy and EPR research on crystals containing 4f or/and 3d transition-metal ions, performed in the Institute of Spectroscopy RAS, in collaboration with the Kazan Federal University, the E.K.Zavoisky Kazan PhysicalTechnical...
2019 / M. N. PopovaWOSScopus -
EPR evidence of surface paramagnetic defects formation due to annealing of LaF3 nanoparticles
An EPR technique and optical measurements have been applied to study LaF3 nanoparticles doped with 7% of Pr3+ ions. It has been found that vacuum annealing of the studied samples leads to the appearance of paramagnetic defects with g-factor close to the value which is typical for the electron...
2019 / R. M. Rakhmatullin, M. S. Pudovkin, V. V. SemashkoWOSScopus -
Magnetic and magnetoelastic properties of non-conducting rare-earth single crystals LiLnF4 (Ln = Tm, Tb, Ho, Dy) (Review)
We review the magnetic and magnetoelastic properties of rare earth tetrafluorides LiLnF4 recently studied at Kazan Federal University in collaboration with the Laboratory of Low Temperatures, Kanazawa University, Japan.
2019 / I. V. Romanova, M. S. TagirovWOSScopus -
Low-temperature luminescence spectrum of forbidden 4f135d−4f14 transitions in CaF2:Lu3+ crystal
The Lu3+ 4f135d−4f14 VUV luminescence in CaF2:Lu3+ crystal at 8K was studied with a high spectral resolution using synchrotron radiation excitation. Absence of a zero-phonon line in the recorded spectrum was explained and features in the recorded spectrum were reproduced by simulation based on the...
2019 / O. V. Solovyev, V. N. Makhov, H. Stryhanyuk, M. KirmWOSScopus -
Paramagnetic centres in crystals YAlO3: Eu, Si
In the spectra of the electron paramagnetic resonance of YAlO3:151Eu single crystals, the signals of the Eu2+, Gd3+, Cr3+, and Mo3+ paramagnetic centers were observed. Using high-frequency EPR, it was shown that the signals of Mo3+ ions observed in the X-range belong to two intradoublet transitions ...
2019 / V. A. Vazhenin, A. V. Fokin, A. P. Potapov, G. S. Shakurov, A. G. Petrosyan, M. Yu. ArtyomovWOSScopus -
Применение полуэмпирических моделей турбулентности для моделирования турбулентной конвекции
Рассматривается возможность использования различных подходов к моделированию турбулентности в условиях развитой конвекции при числах Рэлея высоких порядков. Для исследования выбран ряд промышленно ориентированных задач, имеющих экспериментальные данные. Показано, что при числах Рэлея от 109 до...
2019 / Дмитриев Сергей Михайлович, Крутякова Ольга Леонидовна, Козелков Андрей Сергеевич, Куркин Андрей Александрович, Курулин Вадим Викторович, Уткин Дмитрий Александрович -
Исследование параметров каверны на поверхности воды при падении тела
Представлены результаты численного исследования изменений параметров каверны в зависимости от угла входа тела в воду. Расчеты выполнены в рамках уравнений Навье-Стокса с использованием вычислительного комплекса ЛОГОС. Изучены размеры области возмущения и выявлены закономерности изменения...
2019 / Тятюшкина Елена Сергеевна