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Control of multiferroic order by magnetic field in frustrated helimagnet MnI2. Theory
Journal of Magnetism and Magnetic Materials. 2019. Vol. 475. P. 98-102.
O.I. Utesov, Syromyatnikov A. V.
We provide a theoretical description of frustrated multiferroic MnI2 with a spiral magnetic ordering in magnetic field h. We demonstrate that subtle interplay of exchange coupling, dipolar forces, hexagonal anisotropy, and the Zeeman energy account for the main experimental findings observed recently in this material (Kurumaji et al., Phys. Rev. Lett. 106 (2011) 167206). We describe qualitatively the non-trivial evolution of electric polarization P upon h rotation, changing P direction upon h increasing, and disappearance of ferroelectricity at h > hc, where hc is smaller than the saturation field.
O.I. Utesov, Syromyatnikov A. V., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 No. 18 P. 184406
We discuss theoretically frustrated Heisenberg spiral magnets in magnetic field H. We demonstrate that small
anisotropic spin interactions (single-ion biaxial anisotropy or dipolar forces) select the plane in which spins rotate
(spiral plane) and can lead to the spiral plane flop upon in-plane field increasing. Expressions for the critical
fields Hflop are derived. It is shown that measuring ...
Added: January 16, 2021
O.I. Utesov, Syromyatnikov A. V., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 5 P. 054439
We discuss theoretically phase transitions in frustrated antiferromagnets with biaxial anisotropy or dipolar
forces in magnetic field applied along the easy axis at T = 0. There are well-known sequences of phase
transitions on the field increasing: the conventional spin-flop transition and the flop of the spiral plane at strong
and weak easy-axis anisotropy, respectively. We argue that ...
Added: January 16, 2021
Utesov O., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 105 Article 054435
A simple mean-field description of frustrated antiferromagnets on hexagonal lattices, aimed to describe the
high-temperature part of the temperature-magnetic field phase diagram, is proposed. It is shown that an interplay
between modulation vector symmetry, Zeeman energy, and magnetodipolar interaction leads to stabilization of
the triple-Q skyrmion lattice in a certain region of the phase diagram. The corresponding analytical ...
Added: March 2, 2022
O.I. Utesov, Syromyatnikov A. V., Journal of Magnetism and Magnetic Materials 2021 Vol. 527 Article 167732
We discuss theoretically a frustrated Heisenberg antiferromagnet in magnetic field close to the saturation one. It is demonstrated that a small biaxial anisotropy and/or the magnetic dipolar interaction produce a delicate balance between phases with a commensurate canted, incommensurate helical (conical), and fan spin orderings. As a result, different sequences of phase transitions are realized ...
Added: February 4, 2021
Oleg I. Utesov, Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 103 No. 6 Article 064414
Motivated by recent experimental results for GdRu2Si2 [Khanh et al., Nat. Nanotechnol. 15, 444 (2020)], in which a nanometric square skyrmion lattice was observed, we propose a simple analytical mean-field description of the high-temperature part of the phase diagram of centrosymmetric tetragonal frustrated antiferromagnets with dipolar interaction in the external magnetic field. Dipolar forces provide ...
Added: February 9, 2021
Arutyunov K., Lehtinen J., Radkevich A. et al., Communications Physics 2021 Vol. 4 No. 1 Article 146
Rapid miniaturization of electronic devices and circuits demands profound understanding of fluctuation phenomena at the nanoscale. Superconducting nanowires - serving as important building blocks for such devices - may seriously suffer from fluctuations which tend to destroy long-range order and suppress superconductivity. In particular, quantum phase slips (QPS) proliferating at low temperatures may turn a ...
Added: October 30, 2021
Boldyrev K., Молчанова А. Д., Ерофеев А. С. et al., Journal of Physics: Conference Series 2017 Vol. 917 No. 072003 P. 1-4
The work presents a study of manganese-doped copper metaborate (Cu, Mn) B2O4 using optical spectroscopy. The temperature of the antiferromagnetic phase transition T-N = 19 K has been defined according to the absorption spectra. Polarization studies (Cu, Mn) B2O4 in isotropic ab-plane show the presence of linear antiferromagnetic dichroism in the magnetically ordered state previously ...
Added: February 8, 2019
Budkov Y., Kalikin N., Kolesnikov A. L., Chemical Communications 2021 Vol. 57 P. 3983-3986
We develop a new quantitative molecular theory of liquid-phase dipolar polymer gels. We model monomer units of the polymer network as a couple of charged sites separated by a fluctuating distance. For the first time, within the random phase approximation, we have obtained an analytical expression for the electrostatic free energy of the dipolar gel. ...
Added: March 26, 2021
Chertenkov V., Shchur L., Journal of Physics: Conference Series 2021 Vol. 1740 P. 1-5
We formulate the problem of the universality class investigation using machine learning. We chose an example of the universality class of the two-dimensional 4-state Potts model. There are four known models within the universality class – the 4-state Potts model, the Baxter-Wu model, the Ashkin-Teller model, and the Turban model. All four of them together ...
Added: February 19, 2021
O.I. Utesov, Burdin S., Rosa P. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 23 P. 235126
We present a theoretical model of spin transitions in stacks of molecular layers. Our model captures the
already established physics of these systems (thermal hysteretic transitions and crossovers) and suggests a way
towards in situ control of this physics by means of an external electric field. Our results pave the way toward
both temperature and voltage controllable organic ...
Added: January 16, 2021
Sergeev T. T., Zyablovsky A. A., Andrianov E. S. et al., Scientific Reports 2021 Vol. 11 Article 24054
We demonstrate a new type of non-Hermitian phase transition in open systems far from thermal equilibrium, which can have place in the absence of an exceptional point. This transition takes place in coupled systems interacting with reservoirs at different temperatures. We show that the spectrum of energy flow through the system caused by the temperature ...
Added: January 2, 2022
Walls B., Murtagh O., Bozhko S. et al., Materials 2022 Vol. 15 No. 21 Article 7652
The strongly correlated electron material, vanadium dioxide (VO2), has seen considerable
attention and research application in metal-oxide electronics due to its metal-to-insulator transition
close to room temperature. Vacuum annealing a V2O5(010) single crystal results in Wadsley phases
(VnO2n+1, n > 1) and VO2. The resistance changes by a factor of 20 at 342 K, corresponding to the
metal-to-insulator phase ...
Added: December 11, 2022
Blank M., Доклады Академии наук 2011 Т. 436 № 3 С. 295-298
In a recent paper we proposed a new model of the dynamics of
locally interacting particles (with a mean-field type interaction)
and proved that in the limit of weak interactions finite systems
of particles (or CML) may demonstrate both the synchronization,
and independent behavior (i.e. the phase transition takes place),
depending on fine properties of the interaction. Fundamental
technical limitation there ...
Added: November 26, 2014
Андреев А. Ф., Л.А.Мельниковский, Успехи физических наук 2018 Т. 188 № 11 С. 1199-1202
Conditions for applicability of mean field theory to the thermodynamics of the 4He crystal surface are determined. Although the faceting transition itself is of Berezinsky—Kosterlitz—Thouless type, the thermodynamic potential outside a narrow neighborhood of the transition temperature can be expanded in the spirit of the Landau theory of second-order phase transitions. The Ginzburg—Levanyuk parameter is estimated. ...
Added: November 13, 2018
S. K. Gotovko, Soldatov T. A., L. E. Svistov et al., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 No. 9 P. 094425-1-094425-8
We have carried out the electron spin resonance (ESR) study of the multiferroic triangular antiferromagnet CuCrO2 in the presence of an electric field. The shift of ESR spectra by the electric field was observed; the value of the shift exceeds that in materials with linear magnetoelectric coupling. It was shown that the low-frequency dynamics of ...
Added: February 6, 2019
Kuzmin N. N., Maltsev V. V., Volkova E. A. et al., Inorganic Materials 2020 Vol. 56 No. 8 P. 828-835
We have studied and optimized conditions for spontaneous flux growth of TbCr3(BO3)4 crystals.
Phase relations in the pseudoternary system TbCr3(BO3)4–K2Mo3O10–B2O3 have been studied in the temperature
range 900–1130°C and the single-phase terbium chromium borate crystallization field has been
mapped out. It has been shown that increasing the TbCr3(BO3)4 content of the starting high-temperature
solution leads to a rhombohedral-to-monoclinic phase ...
Added: October 22, 2020
Garkul A., Stegailov V., Scientific Reports 2022 Vol. 12 No. 1 Article 13325
Unlike conventional first-order phase transitions, the kinetics of amorphous-amorphous transitions has been much less studied. The ultrasonic experiments on the transformations between low-density and high-density amorphous ice induced by pressure or heating provided the pressure and temperature dependencies of elastic moduli. In this article, we make an attempt to build a microscopic picture of these ...
Added: August 8, 2022
Barash L., Marshall J., Weigel M. et al., / Cornell University. Series cond-mat "arxiv.org". 2018. No. 1808.04340.
Estimating the density of states of systems with rugged free energy landscapes is a notoriously difficult task of the utmost importance in many areas of physics ranging from spin glasses to biopolymers to quantum computing. Some of the standard approaches suffer from a spurious convergence of the estimates to metastable minima, and these cases are ...
Added: October 17, 2018
Shchur L., / Cornell University. Series arXiv "math". 2021. No. 2107.02406.
In the late 80s and 90s, theoretical physicists of
the Landau Institute for Theoretical Physics designed and
developed several specialized computers for challenging
computational problems in the physics of phase transitions.
These computers did not have a central processing unit. They
optimize algorithms to handle elementary operations on
integers - read, write, compare, and count. The approach
allowed them to achieve recording ...
Added: July 26, 2021
Astrakharchik G., Kryuchkov P., Kurbakov I. et al., Crystals 2018 Vol. 8 No. 246 P. 1-26
Ground-state properties of bosons interacting via inverse square potential (three dimensional Calogero-Sutherland model) are analyzed. A number of quantities scale with the density and can be naturally expressed in units of the Fermi energy and Fermi momentum multiplied by a dimensionless constant (Bertsch parameter). Two analytical approaches are developed: the Bogoliubov theory for weak and ...
Added: October 22, 2018
Ilya D. Fedorov, Vladimir V. Stegailov, ChemPhysChem 2023 Vol. 24 No. 6 Article e202200730
The transition of warm dense fluid hydrogen from an insulator to a conducting state at pressures of about 20–400 GPa and temperatures of 500–5000 K has been the subject of active scientific research over the past few decades. However, various experimental and theoretical methods do not provide consistent results. In this work, we have applied the restricted ...
Added: January 31, 2023
Grigoriev S. V., Chubova N. M., Azarova L. A. et al., Annals of Physics 2022 Vol. 447 Article 169132
The cubic noncentrosymmetric structure of the B20 compounds produces the spin helix with the wave vector ks = D/J balanced by the competition of two interactions: the large ferromagnetic exchange interaction J and small antisymmetric Dzyaloshinskii–Moriya (DM) interaction D. The mixed Fe1−xCoxSi compounds demonstrate a switch of the sign of magnetic chirality in dependence of ...
Added: March 6, 2023
Boldyrev K., Молчанова А. Д., Простников М. А. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 96 No. 17 P. 174305-1-174305-11
Copper borate Cu3(BO3)2 is a complex compound with a layered crystallographic structure in which the
Jahn-Teller active and magnetic copper Cu2+ ions occupy 16 nonequivalent positions in the unit cell displaying
controversial magnetic behavior. In this paper, we report on the infrared and Raman spectroscopic studies of
the lattice dynamics and the electronic structure of 3d9 copper states ...
Added: February 8, 2019
Gotovko S.K., Marchenko V. I., Prokofiev A. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 No. 21 Article 214415
We present the electron spin resonance study of the influence of an electric field on the low-field multiferroic magnetic state in LiCuVO4. The shift of the magnetic resonance spectra in the electric field has been observed experimentally. Symmetry analysis has been performed in order to describe the static properties of the magnetic system. The low-frequency dynamics ...
Added: December 10, 2021