A5011693009- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- Ferroelectric and Piezoelectric Materials
- Crystal Structures and Properties
- Magnetic properties of thin films
- Solid-state spectroscopy and crystallography
- High-pressure geophysics and materials
- Magnetic Properties and Applications
- Magneto-Optical Properties and Applications
- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Inorganic Chemistry and Materials
- Shape Memory Alloy Transformations
- Semiconductor materials and interfaces
- Engineering Technology and Methodologies
- Magnetic Properties and Synthesis of Ferrites
- Geophysics and Sensor Technology
- Theoretical and Computational Physics
- Surface and Thin Film Phenomena
- Thyroid Cancer Diagnosis and Treatment
- Quantum and electron transport phenomena
- Metallic Glasses and Amorphous Alloys
Russian Academy of Sciences
2007-2024
Prokhorov General Physics Institute
2015-2024
Moscow Technical University of Communication and Informatics
2019
All-Russian Research Institute Gradient
2019
Federal Scientific Research Centre Crystallography and Photonics
2019
Vavilov Institute of General Genetics
2000-2018
Medical Technologies (Czechia)
2018
King Abdullah University of Science and Technology
2015
Development Agency of Serbia
2009-2012
Institut Laue-Langevin
2012
We report on structural, magnetic, and electrical properties of Sr-doped ${\mathrm{LaMnO}}_{3}$ single crystals for doping levels $0.4<~x<~0.85.$ The complex structural magnetic phase diagram can only be explained assuming significant contributions from the orbital degrees freedom. Close to $x=0.6$ a ferromagnetic metal is followed by an antiferromagnetic metallic below 200 K. This exists in monoclinic crystallographic structure. Following theoretical predictions this antiferromagnet...
The temperature-dependent Raman spectra of orthorhombic $R\mathrm{Mn}{\mathrm{O}}_{3}$ $(R=\mathrm{Pr},\mathrm{Nd},\mathrm{Sm},\mathrm{Eu},\mathrm{Gd},\mathrm{Tb},\mathrm{Dy},\mathrm{Ho},\mathrm{Y})$ were studied in the $5--300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ temperature range. It was established that while materials with large ${R}^{3+}$ ionic radius ${r}_{R}$ and $A$-type antiferromagnetic order $(R=\mathrm{Pr},\mathrm{Nd},\mathrm{Sm})$ exhibit significant phonon softening other...
We report on structural, magnetic, electrical, and thermodynamic properties of Gd-doped $\mathrm{La}\mathrm{Mn}{\mathrm{O}}_{3}$ single crystals for Gd doping levels $0\ensuremath{\leqslant}x\ensuremath{\leqslant}1$. At room temperature, all the orthorhombic O' phase is indicative a strong Jahn-Teller distortion. All compositions are insulating. The magnetism ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Gd}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ dominated by relatively...
We report on structural, magnetic, dielectric, and thermodynamic properties of (Eu:Y)MnO3 for Y doping levels 0 <= x < 1. This system resembles the multiferroic perovskite manganites RMnO3 (with R= Gd, Dy, Tb) but without interference magnetic contributions 4f-ions. In addition, it offers possibility to continuously tune influence A-site ionic radii. For small concentrations 0.1 we find a canted antiferromagnetic paraelectric groundstate. higher 0.3 ferroelectric polarization coexists with...
The magnetic, electric, magnetoelectric, and magnetoelastic properties of rare-earth ferroborates RFe3(BO3)4 (R=Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er) as well yttrium ferroborate YFe3(BO3)4 have been studied comprehensively. A strong dependence not only the magnetic but also magnetoelectric on type ion, specifically, its anisotropy, which determines structure large contribution to electric polarization, has found. This is manifested in temperature polarization below Néel point TN specific field...
We have investigated the complex ac conductivity of for , temperatures and frequencies . In addition, results from dc measurements are presented. From frequency dependence we find hopping Anderson-localized charge carriers as dominant transport process in certain temperature composition ranges. deduce that, while Anderson localization is not driving mechanism metal-insulator transition observed this compound, it responsible high-resistivity regions at low doping levels temperatures. The...
We present a detailed dielectric study of the relaxation effects that occur in several perovskite rare-earth manganites, including multiferroics ${\mathrm{TbMnO}}_{3}$ and ${\mathrm{DyMnO}}_{3}$. demonstrate strong magnetocapacitive effects, observed for electrical fields $\mathbf{E}\ensuremath{\parallel}\mathbf{c}$, are nearly completely governed by magnetic-state induced changes parameters. The multiferroic materials, which undergo transition into spiral magnetic state, show qualitatively...
Magnetic and magnetoelectric excitations in the multiferroic TbMnO3 have been investigated at terahertz frequencies. Using different experimental geometries we can clearly separate electroactive (electromagnons) from magnetoactive modes, i.e., antiferromagnetic resonances. Two resonances were found to coincide with electromagnons. This indicates that both belong same mode electromagnons be excited by a magnetic ac field as well. In spite of 90 degrees rotation cycloid external fields, are...
Apart from being so far the only known binary multiferroic compound, CuO has a much higher transition temperature into state, 230 K, than any other material in which electric polarization is induced by spontaneous magnetic order, typically lower 100 K. Although magnetically ferroelectricity of firmly established, no magnetoelectric effect been observed as direct crosstalk between bulk magnetization and counterparts. Here we demonstrate that high fields about 50 T are able to suppress helical...
The ground-state properties of the perovskites ${\mathrm{PrMnO}}_{3}$ and ${\mathrm{NdMnO}}_{3}$ were investigated by magnetization, magnetic ac susceptibility, specific heat measurements. A strongly anisotropic behavior has been detected for temperatures below antiferromagnetic phase transition ${T}_{\mathrm{N}}\ensuremath{\approx}100\mathrm{K}.$ susceptibility weak spontaneous ferromagnetic moment appear to be different in both compounds due rare-earth contributions. shows strong...
Dielectric permittivity spectra of yttrium-doped $\mathrm{Eu}\mathrm{Mn}{\mathrm{O}}_{3}$ in the composition range $0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.5$ have been investigated terahertz frequency range. Magnetoelectric contributions to were observed all compositions for ac electric fields parallel crystallographic $a$ axis. Well-defined electromagnons exist $x\ensuremath{\geqslant}0.2$ close...
Terahertz electromagnetic excitations in the multiferroic TbMnO3 single crystals are investigated across magnetic field induced rotation of spin cycloid. In addition to electromagnon along a axis, detailed polarization analysis experimental spectra suggests existence an electroactive excitation for ac electric fields wave crystallographic c axis. This is possibly eigenmode spin-cycloid TbMnO3, which has been predicted within inverse Dzyaloshinskii-Moriya mechanism magnetoelectric coupling.
The high-field region of the magnetic phase diagram MnSi is probed by magnetization, resistivity, and magnetoresistance measurements carried out in temperature range 1.8--300 K for fields up to 8 T. It shown that boundary between paramagnetic (PM) spin-polarized (SP) has no positive slope as was suggested previously, appears be practically vertical at transition ${T}_{c}\ensuremath{\sim}$ 30 K. We argue broad maxima resistivity magnetization derivative, which develop $T>{T}_{c}$, are...
Materials showing anisotropic magnetocaloric effects could open the way for new designs of magnetic cooling. In paper by Jin et al. [Phys. Rev. B 83, 184431 (2011)], a rotating effect was pointed out in $\mathrm{TbMn}{\mathrm{O}}_{3}$ single crystals. The reported arises from rotation crystals between their $b$ and $a$ axes. However, this Comment we demonstrate that generate is at least two times larger than On other hand, newly not directly resulted magnetocrystalline anisotropy, also being...
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...