A5064920503- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Inorganic Fluorides and Related Compounds
- Theoretical and Computational Physics
- Magneto-Optical Properties and Applications
- Solid-state spectroscopy and crystallography
- Magnetic properties of thin films
- Glass properties and applications
- Material Science and Thermodynamics
- High-pressure geophysics and materials
- Microwave Dielectric Ceramics Synthesis
- Luminescence Properties of Advanced Materials
- Crystal Structures and Properties
- Photorefractive and Nonlinear Optics
- Optical and Acousto-Optic Technologies
- Material Dynamics and Properties
- Crystallography and Radiation Phenomena
- Spectroscopy and Laser Applications
- Gas Sensing Nanomaterials and Sensors
- Underwater Acoustics Research
- Transition Metal Oxide Nanomaterials
- Quantum optics and atomic interactions
Ioffe Institute
2013-2024
Russian Academy of Sciences
2001-2014
Physico-Technical Institute
1999-2012
University of Puerto Rico System
2010
Paul Scherrer Institute
2010
Physicotechnical Institute
1996
Institute of Semiconductor Physics
1968-1971
A Raman spectroscopic study of the high-frequency optical phonons in single crystals multiferroic system $R{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ ($R=\mathrm{Bi}$, Eu, Dy) was performed. All studied materials show anomalous phonon shifts, below a new characteristic temperature for these materials, ${T}^{*}\ensuremath{\sim}60--65\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The sign and magnitude such shifts appear to be correlated with ionic radius $R$, envolving from softenings $R=\mathrm{Bi}$...
Based on measurements of soft x-ray magnetic diffraction under in situ applied electric field, we report significant manipulation and exciting commensurate order multiferroic ErMn2O5. The induced scattering intensity arises at the Bragg position whereas initial signal almost persists. We demonstrate possibility to imprint a response function ErMn2O5 by applying an field.
High-resolution synchrotron x-ray diffraction measurements were performed on single crystalline and powder samples of BiMn2O5. A linear temperature dependence the unit cell volume was found between T_{N}=38$ K 100 K, suggesting that a low-energy lattice excitation may be responsible for expansion in this range. Between T* ~ 65 T_{N}, all parameters showed incipient magnetoelastic effects, due to short-range spin correlations. An anisotropic strain along a-direction also observed below T*....
The dynamics of ferroelectromagnetic (multiferroic) crystals RMn2O5 (R = Eu and Gd), showing magnetic ferroelectric phase transitions with close transition temperatures (40 30 K for R Gd, respectively), was studied in the frequency temperature ranges 20–300 GHz 5–50 K, respectively. It found that resonance spectra GdMn2O5 are characteristic homogeneous long-range order both antiferomagnetic Mn-subsystem Gd subsystem, possessing a large ferromagnetic moment. In other (with nonmagnetic or...
Studies of magnetization, magnetoresistance, and magnetic oscillations in semiconductor–multiferroics Eu1−xCexMn2O5 (x = 0.2–0.25) (ECMO) at temperatures ranging from 5 to 350 K fields up 6 T are presented. It is shown that phase separation charge carrier self-organization the crystals give rise a layered superstructure perpendicular c axis. An effect field cycling on superstructure, magnetoresistance demonstrated. X-ray diffraction studies ECMO demonstrating The de Haas–van Alphen...
Spin-wave excitations revealed in the dynamically equilibrated one-dimensional superlattices formed due to phase separation and charge carrier self-organization doped single crystals of Eu0.8Ce0.2Mn2O5 Tb0.95Bi0.05MnO3 multiferroics are discussed. Similar excitations, but having lower intensities, were also observed undoped RMn2O5 (R=Eu, Er, Tb, Bi). This suggests that a transfer between manganese ions with different valences, which give rise superlattice formation, occurs as well. The spin...
The state with a giant permittivity $({\ensuremath{\epsilon}}^{\ensuremath{'}}\ensuremath{\sim}{10}^{4})$ and ferromagnetism have been observed above 185 K (including room temperature) in single crystals of diluted semiconductor manganite-multiferroic ${\text{Eu}}_{0.8}{\text{Ce}}_{0.2}{\text{Mn}}_{2}{\text{O}}_{5}$ the investigations x-ray diffraction, heat capacity, dielectric magnetic properties, conductivity, Raman light-scattering spectra this material. X-ray diffraction study has...
A temperature dependent Raman scattering study in multiferroic single crystals RMn2O5 (R=Bi, Eu, and Dy) was performed. The spectra were measured the range from 150to450cm−1 involving mostly Mn–O–Mn bending vibrations, complementing our previous work a higher frequency Mn–O stretching modes. number of studied phonons present anomalous behavior below characteristic temperature, T*∼60–65K, such as that found for sign magnitude appear to be correlated with ionic radius R, being softening R=Bi...
The equations of motion the sublattice moments are discussed in case anisotropic g factors when lengths mechanical conserved, or not conserved. Experimental data on magnetic resonance hexagonal ferrimagnet RbNiF3 and orthorhombic canted antiferromagnet NaNiF3 interpreted basis such with suggestion that It is shown for both crystals g-factor anisotropy must be taken into account.
Resonant magnetic soft x-ray diffraction is used to study the order of Mn sublattices in multiferroic ${\text{ErMn}}_{2}{\text{O}}_{5}$. Data were collected at $\text{Mn}\text{ }{L}_{2,3}$ edges as a function temperature, incident polarization, including analysis scattered polarizations for selected azimuths. The energy dependence reflections depends on azimuthal angle commensurate (CM) ferroelectric (FE) phase, indicating different contributions scattering. In incommensurate...
Polarization, dielectric permittivity, and low-frequency magnetic dynamics (30 – 50 GHz) of GdMn2O5 are presented. The emergence an abnormally high polarization along the b axis reported recently by N. Lee et al. is verified. It found that this rigid observed in internal field. Superlattices formed due to phase separation charge carrier self-organization bulk single crystals revealed. superlattices manifest themselves form a set ferromagnetic resonances which responses individual...
The paper reports on new results obtained for tetragonal quasi-2D antiferromagnetic Eu2CuO4 at temperatures below 30-40 K. A set of ferromagnetic resonance lines similar to ones earlier a number multiferroic manganites (Sanina et al 2012 J. Phys.: Condens. Matter 24 346002), with electric polarization and local conductivity, were measured, i.e., behavior was revealed in low temperatures. We attribute these observations the 1D superlattices that are formed due phase separation...