A5044889441- Luminescence Properties of Advanced Materials
- Inorganic Fluorides and Related Compounds
- Solid-state spectroscopy and crystallography
- Ferroelectric and Piezoelectric Materials
- Advanced Chemical Physics Studies
- Electronic and Structural Properties of Oxides
- Atomic and Molecular Physics
- Solid State Laser Technologies
- Magnetic and transport properties of perovskites and related materials
- Magneto-Optical Properties and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Acoustic Wave Resonator Technologies
- Laser Design and Applications
- Glass properties and applications
- Spectroscopy and Laser Applications
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Graphite, nuclear technology, radiation studies
- Perovskite Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Laser-Matter Interactions and Applications
- Graphene research and applications
- Crystal Structures and Properties
- Magnetic Properties and Applications
Kazan Federal University
2014-2024
Institute of Physics
2011-2024
Russian State Scientific Center for Robotics and Technical Cybernetics
2017
Saint Petersburg State University of Economics
2015
St Petersburg University
2002-2009
Russian Academy of Sciences
1997
Prokhorov General Physics Institute
1993
Pushkin Leningrad State University
1976-1985
${\mathrm{SrEr}}_{2}{\mathrm{O}}_{4}$ is a geometrically frustrated magnet which demonstrates rather unusual properties at low temperatures including coexistence of long- and short-range magnetic order, characterized by two different propagation vectors. In the present work, effects crystal fields (CFs) in this compound containing four magnetically inequivalent erbium sublattices are investigated experimentally theoretically. We combine measurements CF levels ${\mathrm{Er}}^{3+}$ ions made...
The operator for the interaction of a charged quantum particle with an excited hydrogen-like atom or ion is considered in dipole approximation. A new additional integral motion and related symmetry group are found. broader approximate expressions eigenvalues eigenfunctions proposed semiclassical limit large total orbital momentum. qualitative peculiarities spectrum discussed limiting cases considered. comparison results other authors analytical numerical data made. applicable to doubly...
Experimental and theoretical studies of the dynamic magnetization in swept magnetic fields orthorhombic ${\mathrm{SrY}}_{2}{\mathrm{O}}_{4}$ single crystals doped with ${\mathrm{Dy}}^{3+}$ Kramers ions (0.01 at. % 0.5 %) natural abundances even odd Dy isotopes are presented. Impurity substitute for ${\mathrm{Y}}^{3+}$ at two nonequivalent crystallographic sites same local ${C}_{s}$ symmetry but strongly different crystal fields. Well-pronounced double-loop hysteresis is observed temperatures...
Group-theoretical schemes of classification the doubly excited states two-electron atom are based on theory addition four angular momenta. A new scheme with high total orbital momentum is proposed for case when one electron much more than another. The group-theoretical state vectors compared results qualitative and numerical study configuration interaction. Exceptions to discussed.
The possibility of interpreting doubly excited states the two-electron atom as vibro-rotational is discussed in current literature. In particular model problem two particles moving on sphere was studied by Ezra and Berry (1982). object present series papers to perform ab initio analysis problem. It begins proper choice variables: Euler angles describing rotation both electrons collectively dynamical variables-the electron distances from nucleus distance between electrons. transition...
The autoionisation of doubly excited atomic states with one electron much more than the other is considered in one-configuration approximation. theory asymptotic large angular momentum highly electron. direct process results ejection high Rydberg whereas exchange inner ejected and outer passes into low-lying orbital. multipole expansion interaction reduces calculation to finding behaviour one-electron matrix element between continuum for some power radial variable. Slater-type or Coulomb...
The nonlinear response of a system subject to periodic force in the presence noise is investigated. It shown that physical general type manifests stochastic resonance at higher harmonics. curves are calculated for several monostable systems. Higher harmonic measured on part domain wall pinned by magnetic defect ferrite-garnet film.
The absorption and luminescence spectra of a LiBaF3:Pb2+ crystal are studied in the temperature range 10–300 K. At 300 K structureless band (A band) is found energy 1.4–6.6 eV. at 10 composed two A' A1 bands with maxima ~5.0 ~4.0 eV, respectively. originates from 'regular' Pb2+ centres. decay single-exponential whole properties observed described well within semiclassical theory based on Franck–Condon principle Jahn–Teller effect excited sp configuration. possible nature discussed.
Reactive dc magnetron sputtering was employed to produce thin films of titanium nitride using metallic target, argon as the plasma gas and nitrogen reactive gas. A set studied deposited on Si, fused silica crystalline (001) MgO substrates with various deposition conditions. The Si SiO2 are polycrystalline while at slow rate heated 600°C substrate highly epitaxial according both XRD LEED data. Electrical resistivity measured by means four-probe van der Pauw method.
The existence of additional (more general than geometrical) symmetry is established for two important physical systems. first them the excited hydrogen atom in perpendicular electric and magnetic fields when only terms linear field strength are taken into account (corresponding to first-order perturbation theory). In particular, one can be absent, some discrete transformations appear. second system doubly two-electron with dipole approximation electron-electron interaction. these systems...
High-resolution spectroscopic studies of $\mathrm{LaAl}{\mathrm{O}}_{3}$ single crystal doped with holmium ions are reported. Polarized and unpolarized absorption luminescence spectra were measured in the broad spectral range from 2000 to $23\phantom{\rule{0.16em}{0ex}}000\phantom{\rule{0.16em}{0ex}}\mathrm{c}{\mathrm{m}}^{--1}$ at temperatures 4.5--5 K. Additional measurements fulfilled using site-selective laser spectroscopy. Energies symmetry properties corresponding wave functions...
The luminescence spectra of KZnF3:Tl+ and KMgF3:Tl+ crystals with a perovskite structure were investigated in the temperature range 4.2–300 K at optical excitation A absorption band (∼6 eV). spectrum 300 is wide maximum Emax 5.48 eV width about 0.47 eV. At 100 splits into two components: an intensive one = 5.63 0.2 weak 4.66 4.2 broad practically disappears narrow line accompanied by vibration observed E 5.725 This assigned to zero-phonon transition from metastable 3 Γ 1u level ground 1 1g...
For pt.I, see ibid., vol.18, p.4349-69 (1985). The problem of two interacting particles moving on a sphere can be considered as useful model for the analyses, feasible vibro-rotational states in two-electron atom. object authors paper is an ab initio treatment contrast to numerical calculations by Ezra and Berry (1982). zero-order Hamiltonian chosen describe rotations two-particle system whole vibrations over distance between (or angle theta 12). residual part mixes rotational vibrational...
The nonlinear optical properties of silica glass with copper nanoparticles synthesized by ion implantation were investigated z-scan method in nanosecond time scale. reverse saturation absorption (RSA) at the wavelength range 450–540 nm and (SA) 550–585 observed. It was supposed that two-photon electron from bound d-states determined RSA effect SA is due to plasmon excitation.
The positions of the Charge Transfer (CT) and 4f- 4f<SUP>n-1</SUP>5d (fd) transitions trivalent rare-earth ions in CsCdBr<SUB>3</SUB> are estimated using Jorgensen Dorenbos methods, respectively. CT spectra Sm<SUP>3+</SUP>, Eu<SUP>3+</SUP>, Tm<SUP>3+</SUP> Yb<SUP>3+</SUP> f-d Pr<SUP>3+</SUP> were measured. Experimental theoretical results compared.
The absorption spectra of KZnF3:Tl+ and KMgF3:Tl+ crystals have been measured over the energy range 1.5-6.4 eV at temperatures 10-300 K. A wide band with a clear doublet structure identified as an Tl+ impurity centres is observed for both crystals. position band, its bandwidth distribution intensity between two components are temperature dependent in T>65