A5084625365- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Magnetic Properties and Synthesis of Ferrites
- Magneto-Optical Properties and Applications
- Solid-state spectroscopy and crystallography
- Physics of Superconductivity and Magnetism
- Magnetic properties of thin films
- Theoretical and Computational Physics
- Ferroelectric and Piezoelectric Materials
- Magnetic Properties and Applications
- Inorganic Fluorides and Related Compounds
- Acoustic Wave Resonator Technologies
- Crystallization and Solubility Studies
- Terahertz technology and applications
- Iron-based superconductors research
- Mineralogy and Gemology Studies
- Spectroscopy and Quantum Chemical Studies
- X-ray Diffraction in Crystallography
- Crystal Structures and Properties
- High-pressure geophysics and materials
- Geophysics and Sensor Technology
- Photonic and Optical Devices
- Silicon Nanostructures and Photoluminescence
- Advanced Chemical Physics Studies
Moscow Institute of Physics and Technology
2013-2022
Prokhorov General Physics Institute
2013-2022
Russian Academy of Sciences
2005-2014
Institute of Physics and Technology
2014
Helmholtz-Zentrum Dresden-Rossendorf
2012
University of Stuttgart
2012
Development Agency of Serbia
2009
Troitsk Institute for Innovation and Fusion Research
2004-2007
Kurchatov Institute
2004
Vavilov Institute of General Genetics
1987-2003
Water is characterized by large molecular electric dipole moments and strong interactions between molecules; however, hydrogen bonds screen the dipole-dipole coupling suppress ferroelectric order. The situation changes drastically when water confined: in this case ordering of dipoles has been predicted, but never unambiguously detected experimentally. In present study we place separate H2O molecules structural channels a beryl single crystal so that they are located far enough to prevent...
Abstract Intermolecular hydrogen bonds impede long-range (anti-)ferroelectric order of water. We confine H 2 O molecules in nanosized cages formed by ions a dielectric crystal. Arranging them channels at distance ~5 Å with an interchannel separation ~10 prevents the formation networks while electric dipole-dipole interactions remain effective. Here, we present measurements temperature-dependent permittivity, pyrocurrent, polarization and specific heat that indicate order-disorder...
We have measured the magnetization and specific heat of multiferroic CoCr2O4 in magnetic fields up to 14 T. The high-field measurements indicate a new phase transition at T* = 5 - 6 K. between lock-in 15 K is characterized by irreversibility. At higher fields, irreversibility increases. Specific-heat confirm T*, also show irreversible behavior. construct field-temperature diagram CoCr2O4.
We report on an investigation of optical properties multiferroic CoCr${}_{2}$O${}_{4}$ at terahertz frequencies in magnetic fields up to 30 T. Below the ferrimagnetic transition (94 K), response is dominated by a magnon mode, which shows steep magnetic-field dependence. ascribe this mode exchange resonance between two sublattices with different $g$ factors. In framework simple two-sublattice model (the are formed Co${}^{2+}$ and Cr${}^{3+}$ ions), we find inter-sublattice coupling constant,...
The complex dielectric permittivity and the magnetic permeability of orthoferrites RFeO/sub 3/ (R=Y, Tm, Dy, Gd, Ho, Er, Tb) Y/sub 1-x/Lu/sub x/FeO/sub have been investigated at submillimeter wavelengths v=100-1000 GHz. parameters two antiferromagnetic resonance modes (resonance frequencies, linewidths, mode contributions to static permeability) obtained. authors observed electronic transitions inside TM/sup 3+/, Er/sup Ho/sup 3+/ ground multiplets found a strong influence this excitation on...
Abstract Magnetic and electrical properties of Sm 1– x Sr MnO 3 (0 ≤ 0.8) single crystals have been studied the T – phase diagram has revised. The compensation points spontaneous weak ferromagnetic moment observed for pure SmMnO low doped compositions < 0.05). For 0.4 0.475 ordering occurs as a first‐order transition. It is shown that in magnetic field temperature this transition increases becomes broader, which results appearance critical point ( cr ∼ 193 K, H 68 kOe = 0.45). Another...
The optical conductivity and permittivity spectra of Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_{2}$As${}_{2}$ films (${T}_{c}=20 \text{K}$) are analyzed together with the literature data on photoemission specific heat. In superconducting state at all temperatures up to ${T}_{c}$ temperature dependence magnetic field penetration depth is well described within generalized two-band BCS model intraband interband pairing interactions considered. It shown that small energy gap...
Low-energy excitations of a single water molecule are studied when confined within nano-size cavity formed by the ionic crystal lattice. Optical spectra measured manganese doped beryl Mn:Be3Al2Si6O18, that contains molecules individually isolated in 0.51 nm diameter voids Two types orientation distinguished: water-I have their dipole moments aligned perpendicular to c axis and water-II parallel c-axis. The optical conductivity σ(ν) permittivity ɛ'(ν) recorded terahertz infrared ranges, at...
Recently, the low-temperature phase of water molecules confined within nanocages formed by crystalline lattice water-containing cordierite crystals has been reported to comprise domains with ferroelectrically ordered dipoles a, b-planes which are antiferroelectrically alternating along c-axis. In present work, comprehensive broad-band dielectric spectroscopy is combined specific heat studies and molecular dynamics Monte Carlo simulations in order investigate more detail collective modes...
Compounds with the Ca3Ga2Ge4O14 structure containing Co2+, Mn2+ and Fe3+ ions in 3f position were synthesized their magnetic properties studied at low temperatures. Long range antiferromagnetic ordering triangular net lattice has been observed TN = 7–40 K.
The low-energy electrodynamic response of a series ${\text{La}}_{0.25}{\text{Ca}}_{0.75}{\text{MnO}}_{3}$ samples different morphology is systematically studied in the frequency range from 4 to $700\text{ }{\text{cm}}^{\ensuremath{-}1}$ (0.1--20 THz, quantum energies 0.4--90 meV) with particular attention focused at frequencies below $40\text{ }{\text{cm}}^{\ensuremath{-}1}$. In antiferromagnetically ordered phase 140 K, resonancelike absorption band appears spectra around $20--40\text{ that...
Broad-band (4-20 000 cm-1) spectra of real and imaginary conductance a set high-quality pristine AuCl3-doped single-walled carbon nanotube (SWCNT) films with different transparency are systematically measured. It is shown that while the high-energy (≥1 eV) response determined by well-known interband transitions, lower-energy electrodynamic properties fully dominated unbound charge carriers. Their main spectral effect seen as free-carrier Drude-type contribution. Partial localization these...
Terahertz and infrared spectra of the optical response DyScO3 single crystal are measured at temperatures from 5 K to 300 for two different polarizations E‖[1¯01] E‖[010], i.e., along crystallographic directions substrates used growing thin films heterostructures. Detailed reference data on terahertz dielectric characteristics substrate presented. We discuss mechanisms responsible electromagnetic absorption. Phonon analyzed with results group-theoretical analysis structure. Besides phonon...