A5053393700- Solid-state spectroscopy and crystallography
- Advanced Condensed Matter Physics
- High-pressure geophysics and materials
- Advanced NMR Techniques and Applications
- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- Catalysis and Oxidation Reactions
- Crystal Structures and Properties
- Magnetic and transport properties of perovskites and related materials
- NMR spectroscopy and applications
- Chalcogenide Semiconductor Thin Films
- Gas Sensing Nanomaterials and Sensors
- Seismic Waves and Analysis
- Thermodynamic and Structural Properties of Metals and Alloys
- Magnetic Properties of Alloys
- Electromagnetic Effects on Materials
- Atomic and Subatomic Physics Research
- Graphite, nuclear technology, radiation studies
- Semiconductor materials and interfaces
- Phase-change materials and chalcogenides
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Iron-based superconductors research
- Advanced Chemical Physics Studies
- Seismic Imaging and Inversion Techniques
Kurchatov Institute
2010-2025
Moscow Institute of Physics and Technology
2013-2023
Institute of Radio and Information Systems (IRIS)
2023
All-Russian Scientific Research Institute of Technical Physics
2014-2018
Institute of Applied Physics
2014
Max Planck Society
2003
University of Copenhagen
1986
Institute of Atomic Energy
1984
Polarized Raman spectra of oriented monoclinic single crystals have been obtained at temperatures 20 - 650 K in the region . The assignment bands to and modes was given. photoinduced reduction intensity observed after heating a crystal above 500 K, cooling it down room temperature, under laser irradiation. A lattice dynamical analysis based on two-particle interatomic potentials rigid-ion model performed. These were consistent with IR data, besides which they showed stable dynamics...
A detailed neutron powder diffraction study of the atomic structure α-Bi 2 O 3 at high temperatures using Rietveld method was performed to clarify nature unusual magnetic behavior and origin temperature dielectric anomalies in interval 300–700 K. Analysis obtained experimental data shows that there are no evidence a structural phase transition between 295 660 The observed evidently governed by changes electron subsystem bismuth oxide.
Measurements of infrared polarized reflectance spectra single-crystal have been made at room temperature in the wavelength range from 30 to for different orientations wave vector k and electric field E incident radiation relative crystallographic axes. On basis Born Huang's theory, relations between characteristics TO modes monoclinic lattice reflectivity used are established. Dipole momentum orientations, frequencies, strengths linewidths almost all IR-active predicted by factor-group...
Nuclear quadrupole resonance and SQUID-magnetometric studies on magnetic properties of bismuth(III) oxy compounds comprising neither d- nor f-elements are surveyed systematised. The properties, not conventionally expected in the Main Group element substances, were found to exist most discussed. results analysis zero-field 209Bi NQR line shapes, Zeeman-perturbed patterns external fields various orientations with respect crystal axes, spin-echo envelopes suggest existence α-Bi2O3 , Bi3O4Br,...
Abstract A very unusual magnetic behaviour of α - Bi 2 O 3 was observed in a wide range temperatures and fields. longitudinal magnetoelectric effect found at 4.2 K. The existence an antiferroelectrically ordered subsystem electric dipoles is proposed. mechanism spin-orbit coupling regarded as the physical origin for occurrence moments 3.
Abstract The splittings observed in the 209 Bi nuclear quadrupole resonances of α-Bi 2 O 3 , zero magnetic field, follow typical pattern a Zeeman perturbed NQR spectrum. lineshapes 4 Br also indicate poorly resolved splitting that points to presence an internal field order 200 G. This exceeds notably dipole fields (about several G), but is orders magnitude smaller than paramagnetic produced by unpaired electron spins. results obtained using SQUID and μSR-technique can be interpreted as...
Earlier methods for the description of alloys with strong interatomic correlations are used to study H-H interactions and thermodynamical properties hydrogen in systems NbHx type. Explicit expressions given configurational contributions thermodynamics disordered phase. These estimate parameters from experimental data. It has been found that vicinity some x=xs approximately=0.6 concentration dependence partial enthalpy changes sharply. A model is suggested which relates this anomaly a change...
Abstract The NQR line shapes of 209 Bi in the α-Bi 2 O 3 -based mixed oxides • 2M (M = Al, Ga). 3GeO , and 2Bi are recorded zero weak magnetic fields (H ext < 500 Oe) compared with results computer simulation. Splittings shape asymmetry, exhibited by resonances, suggest that internal fields, similar to those earlier reported for 4 Br, may exist these compounds. In spectra single crystal Ge 12 multiplicity external is higher than simulated, which might from domains crystal. a notable...
Herein, the electronic band structure and charge density distribution are theoretically studied in trigonal Se Te to clarify uncertainty stemming from different views on types of chemical bonding their crystals reconsider role valence s- p-electrons bonding. The lack overlapping lower upper bands large separation present an opportunity estimate contributions densities two bond critical points (BCPs) Se. Valence s-electrons significantly contribute BCPs first type, covalently connecting...