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Structural studies of epoxy resin with impurities of carbon nanostructures Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 D. E. Hurova, S. V. Cherednichenko, N. A. Aksenova, N. А. Vinnikov, А. V. Dolbin, N. N. Galtsov
In this work, using X-ray diffractometry and optical microscopy, studies of epoxy-based composites containing a small amount of nanostructures (nanotubes and graphene oxide) were carried out. The test substance was used to glue two aluminum plates together, and then they were stretched in different directions until rupture. Using X-ray diffractometry, it was found that the introduction of an impurity
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On the classification of degenerate equilibrium states of multisublattice SU(4) magnets with spin s = 3/2 Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 M. Yu. Kovalevsky
The equilibrium states of multisublattice magnets with spin s = 3/2 are studied. The developed approach essentially uses the symmetry properties of the Hamiltonian, the idea of the residual symmetry of the equilibrium state, and the form of order parameters. On this basis, without using any model assumptions, classification equations for order parameters are obtained. Solutions of these equations are
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Low-temperature magnetic field behavior of elastic modules in UTe2 Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 A. A. Zvyagin, G. A. Zvyagina
The theory for the low-temperature behavior of sound velocities (and related elastic modules) in the external magnetic field in UTe2 is proposed. The theory is based on the dual model. The model takes into account 5f2 electrons of U ions: both itinerant electrons (part of which form pairs, responsible for the superconductivity) and localized ones. The theory explains the metamagnetic-like jumps in
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The effect of hydrogenation on the electrophysics and magnetic characteristics of dysprosium Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 V. I. Sokolenko, A. O. Chupikov, M. M. Pylypenko, M. B. Lazareva, O. Yu. Roskoshna
The effect of hydrogenation from the gas phase on the change in the character of the temperature dependence of the electrical resistivity ρ(T) in the range of 77–300 K and the temperatures of phase magnetic transformations (Curie temperature TC and Néel temperature TN) of dysprosium was studied. It follows from the experimental data and their analysis that, within the framework of the indirect exchange
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Magnetic properties of the frustrated Ising chain Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 D. V. Laptiev, O. O. Kryvchikov, Yu. V. Savin, V. V. Slavin
Using the Kramers–Wannier transfer matrix method, we studied several decorated Ising chains. The exact expressions for thermodynamic characteristics, including the ground state characteristics, were obtained. We considered several modeling chains with different signs and absolute values of exchange constants for the nearest- and the next-nearest neighbors. For these models, we calculated the magnetization
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Double quantum dot spin resonances with a time-dependent spin-orbit coupling Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 G. Giavaras
Two-spin resonances in double quantum dots with a constant spin-orbit coupling (SOC) can be induced by an ac field which periodically modulates the energy detuning. But a large ac field amplitude may unintentionally trigger an ac modulation in the SOC, which in turn can alter the frequency of the resonances and the form of the current peaks. Here, we demonstrate that depending on the applied magnetic
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Dynamics of magnetic vortices in the field of local inhomogeneity of a ferromagnet Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 A. S. Kovalev
The rotation of a magnetic vortex in a ferromagnet with a local smooth change in the exchange interaction is considered. The frequency of this precession is found for all distances of the vortex from defect center. The rotation velocity of the vortex nonmonotonically depends on the distance to the center, reaching a maximum at a distance of the order of the characteristic dimension of the defect. The
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The energy spectrum and magnetization profile of the decorated spin ladder systems Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 V. O. Cheranovskii, E. V. Ezerskaya, S. Ye. Kononenko
The peculiarities of the energy spectrum of the decorated mixed spin two-leg ladder system having three spin unit cells have been studied by the perturbation theory in the limit of dominant spin coupling in ladder rungs. It is shown, that despite the singlet ground state, this spin ladder may have an intermediate plateau in a low-temperature magnetization profile. The existence of a similar plateau
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Short notes: Measurements on the heat capacity of thermal reduced graphene oxide down to 0.3 K Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 V. V. Sumarokov, A. V. Dolbin, A. Jeżowski, D. Szewczyk, D. Gnida, N. A. Vinnikov, M. I. Bagatskii
The specific heat of thermally reduced graphene oxide (trGO) was measured by a thermal relaxation method in the temperature range from 0.3 to 275 K. It was found that the temperature dependence of the heat capacity С(Т)/T vs T2 of trGO is nonmonotonic. It has been established that in the temperature range of 0.3–6 K there is an anomalous behavior of the temperature dependence of the heat capacity trGO
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Temperature effect and Rashba effect of polaron in a parabolic quantum well Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 Shu-Ping Shan
Using Tokuda’s improved linear combination operator method and variational technique, the expression of the polaron effective mass in an parabolic quantum well is derived. Due to the spin-orbit interaction, the effective mass of polaron splits into two branches. The dependence of effective mass on temperature and mean number phonons is discussed by numerical calculation. The effective mass of polaron
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Dynamical characteristics of inhomogeneous molecular aggregates Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 I. Yu. Ropakova, A. A. Zvyagin
The dynamical characteristics of one-dimensional molecular aggregate with the randomness in exciton hopping is considered. We show that the randomness of the distribution of signs of the exciton hopping of the aggregate dramatically changes the dynamical characteristics. In the homogeneous case, the dynamical characteristics of the molecular aggregate manifest narrow lines at edges of the band of Frenkel
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Dissociation of composite Abrikosov vortices in two-band superconductors in a strong rf field Low Temp. Phys. (IF 0.8) Pub Date : 2024-02-22 A. O. Pokusinskyi, A. L. Kasatkin
In several theoretical works, it was argued that under certain conditions Abrikosov vortices in multiband superconductors can split and exist in the form of fractional vortices, formed separately in superfluid condensates of different electron bands. Such vortices possess a fractional flux quantum, and these fractional vortices attract each other, trying to join into a composite vortex with the whole
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Model study of the protein-ligand binding in the development of hypersensitivity to folic acid and its analogs Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 N. V. Khmil, V. G. Kolesnikov
Folic acid (FA) plays a vital role in various metabolic processes, including synthesis and repair of DNA, cell division, the production of red blood cells, and fetal development. However, hypersensitivity to FA and its analogs can occur, leading to various symptomatic manifestations, including shortness of breath, skin rashes, itching, hives, swelling, gastrointestinal disturbances, tachycardia, and
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Thermomagnetoelectric convective effect in normal and superfluid systems Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 O. M. Konstantynov
Thermomagnetoelectric effect for the dielectric hydrodynamic system is considered. It is established that in a liquid, which is placed in a magnetic field, the temperature gradient can cause a convective mass flow, which leads to the appearance of an electric field in the surrounding space. The distribution of electric potential for various geometric implementations is calculated. A comparison of the
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Design of deeply cooled ultra-low dissipation amplifier and measuring cell for quantum measurements with a microwave single-photon counter Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 O. G. Turutanov, A. M. Korolev, V. I. Shnyrkov, A. P. Shapovalov, M. Baránek, S. Kern, V. Yu. Lyakhno, P. Neilinger, M. Grajcar
The requirements and details of designing a measuring cell and low-back-action deeply-cooled amplifier for quantum measurements at 10 mK are discussed. This equipment is a part of a microwave single-photon counter based on a superconducting flux qubit. The high-electron mobility transistors (HEMTs) in the amplifier operate in unsaturated microcurrent regime and dissipate only 1 μW of dc power per transistor
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The effect of O2 pressure on phase formation and superconductivity properties of Tl-based HTS Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 D. L. Surmanidze, T. E. Lobzhanidze, I. R. Metskhvarishvili, G. N. Dgebuadze, V. M. Gabunia, B. G. Bendeliani, M. R. Metskhvarishvili, D. A. Jishiashvili
Thallium-based high-temperature superconductors exhibit excellent superconductivity performance (Tc, Jc). Formation of the Tl-based superconducting materials critically depends on the used precursor and synthesis conditions. In the present investigation, we used the in situ polymerization method for synthesizing high-purity and reaction-ability precursors. We find the critical dependence of Tl-based
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Luminescent monitoring the state of dichroic complexes in polaroids based on polyvinyl alcohol Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 A. V. Tyurin, S. A. Zhukov, A. Yu. Akhmerov
In this work, to control the content of dichroic complexes in film polarizers based on polyvinyl alcohol, a luminescent technique is proposed that allows us to estimate: the ratio of molecular and paired iodine centers in H-type polarizers at T = 4.2 K; of dichroic complexes caused by molecular and aggregated forms of the dye in L-type polarizers at T = 300 K. The use of this technique will make it
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Numerical modeling of metal-dielectric metasurface as an element of microwave sensors for biomedical applications Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 K. S. Kuznetsova, V. A. Pashynska, Z. E. Eremenko
This paper reports the results of numerical modeling of wave reflection coefficient behavior of the metal-dielectric metasurface at microwaves that can be used for biomedical applications. The study includes optimization of the working parameters of the metasurface-based structure as a sensitive element of a microwave sensoring systems for determination of proteins concentration in different solutions
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The influence of the condensation rate on the structure of Cu-Mo pseudoalloys Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 V. Riaboshtan, A. Zubkov, M. Zhadko, E. Zozulya, E. Zubarev
The structure and microhardness of Cu-0.3 at. % Mo vacuum condensates obtained at different deposition rates, both in the initial state and after isothermal annealings carried out up to 800 °C, were studied in the work. It has been established that molybdenum has a dispersing effect on the grain structure of the copper matrix, which consists of the blocking effect of monoatomic molybdenum adsorption
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Low-temperature anomalies of the dielectric permeability of Sn2P2S6 crystals Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 H. Ban, D. Gal, A. Kohutych, A. Molnar
Low-temperature anomalies of dielectric permittivity of Sn2P2S6 crystals were investigated. It is shown that these phenomena have a relaxation character and the observed anomalies could be related to the small hole polarons dynamics with donor-acceptor compensation processes in lattice with tin and sulfur vacancies. To confirm it, we measured the dielectric properties of tin-enriched and sulfur-enriched
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Comparative study on the effect of substrates on electrical properties of tin and chromium thin films Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 S. Udachan, S. B. Kolavekar, N. H. Ayachit, L. A. Udachan, S. Siddanna, S. S. Kolkundi, K. Naveen Kumar
In thin film technology, substrate materials happen to be one of the deposition parameters that determine the physical properties of films. Hence, soda-lime glass and quartz continue to be the widely utilized substrate materials because of their high-frequency performance, price, and surface quality. For certain applications, various substrate materials that provide an acceptable compromise for the
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Superradiance and solids: Reduced description method Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 S. Lyagushyn, A. Sokolovsky
Spontaneous ordering in a system of excited emitters with a powerful short radiation pulse predicted by Dicke attracted the great attention of scientists for decades as a bright example of the nontrivial behavior of a nonequilibrium system. The Bogolyubov reduced description method has some advantages and provides new possibilities in the theoretical investigation of the Dicke process. The paper presents
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Reduction of g2(0) value in heralded spontaneous parametric down-conversion sources using photon number resolving detectors Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 C. Bruscino, M. Ejrnaes, P. Ercolano, D. Salvoni, C. Zhang, H. Li, L. You, L. Parlato, G. P. Pepe
Single Photon Sources (SPSs) play a pivotal role in fields such as quantum communication and quantum cryptography by generating information in a secure manner. However, realizing the ideal emission of single photons with high efficiency is still a theoretical model. This leads to the presence of multiphoton components in SPSs, which could potentially compromise security. This study focuses on enhancing
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Growth and crystal structure of CdTe1−xSex (x ≥ 0.75) thin films prepared by the method of high-frequency magnetron sputtering Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 A. I. Kashuba, B. Andriyevsky
CdTe1–xSex (x = 0.75 and 0.95) thin films were deposited on quartz substrate by the method of high-frequency magnetron sputtering. The chemical composition analysis and crystal structure refinement was examined with using X-ray fluorescence spectroscopy and X-ray diffraction data. CdTe1–xSex thin films crystallizes in hexagonal structure [structure type—ZnO, space group P63mc (No. 186)]. Unit cell
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Involvement of cationic sublattices in multiple polarization states in CuInP2S6 ferrielectrics Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 R. Yevych, V. Liubachko, Yu. Vysochanskii
The contribution of copper and indium cationic sublattices on polarization hysteresis loops in CuInP2S6 van der Waals ferrielectrics has been studied within the quantum anharmonic oscillator model that considers the ordering dynamics of Cu+ cations in the double-well local potential and displacive dynamics of In3+ cations in the three-well shaped potential. The multiple polarization states are manifested
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Cryovacuum facilities for studying astrophysical ices Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 O. Golikov, D. Yerezhep, A. Akylbayeva, D. Sokolov, E. Korshikov, A. Aldiyarov
This work introduces a cryovacuum apparatus used to investigate substances under near-space conditions. This device allows one to study the refractive index, infrared spectra, and density of substances that are condensed from the vapor phase onto a cooled substrate at temperatures ranging from 11 K to 300 K. Concurrently, the ultimate pressure of 0.1 nTorr can be obtained in the vacuum chamber. The
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New emission band of solid nitrogen Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 E. V. Savchenko, I. V. Khyzhniy, S. A. Uyutnov, M. A. Bludov
New results on the study of radiation effects in solid nitrogen and N2-doped Ne matrix are presented, with a focus on the so-called γ-line origin. The irradiation was carried out in dc regime with an electron beam of subthreshold energy. The relaxation dynamics was monitored by emission spectroscopy: cathodoluminescence (CL) and nonstationary luminescence (NsL), along with current activation spectroscopy
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The effect of biologically active substances on BSA and on the textures of films obtained by drying water-salt solutions of BSA Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 O. A. Gorobchenko, D. M. Glibitskiy, O. T. Nikolov, T. A. Cheipesh, T. N. Dzhimieva, I. S. Zaitseva, A. D. Roshal, M. A. Semenov, G. M. Glibitskiy
In the previously published results, we studied the effect of flavin mononucleotide (FMN), sodium halides NaF and NaBr, iron chloride FeCl3 and aluminum chloride AlCl3 on zigzag patterns of films obtained from saline solutions of bovine serum albumin (BSA). Changes in the properties of the biopolymer and its aqueous environment in solutions were monitored by UV absorption and fluorescence spectroscopy
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Selective uptake and desorption of carbon dioxide in carbon honeycombs of different sizes Low Temp. Phys. (IF 0.8) Pub Date : 2024-01-11 N. V. Krainyukova, D. G. Diachenko, E. A. Kotomin
Carbon honeycombs (CHs) are new carbon cellular structures, very promising in many respects, in particular, for high-capacity storage of various materials, especially in gaseous and liquid forms. In this study, we report a strong uptake of carbon dioxide kept inside carbon honeycomb matrices up to temperatures about three times higher as compared with CO2 desorption at ≈ 90 K from flat solid surfaces
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Effect of electron-electron collisions on entrance potential drop in high-mobility 2DEG channels Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 P. V. Pyshkin, A. V. Yanovsky
Usually, the evidence of viscous hydrodynamic transport of frequently colliding conduction electrons is considered to be the “Gurzhi effect,” which requires the scattering of electrons on the channel walls with momentum loss. However, we demonstrate that expansion of Sharvin’s potential drop directly related to frequent electron-electron collisions can be detected even in channels with ideally smooth
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Nonlinear dynamics of magnetic multilayers. II. Antiferromagnetic interlayer interaction Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 A. S. Kovalev, E. V. Ezerskaya, L. R. Krbashyan
An essentially nonlinear dynamics with a high level of excitation of a magnetic multilayer consisting of two nanolayers with a nonisotropic antiferromagnetic interaction between the layers is considered. The theoretical study was carried out within the framework of discrete Landau–Lifshitz equations without damping. Exact solutions of this integrable system are obtained for all types of nonlinear excitations
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Near-field heat transfer between disordered conductors Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 Alex Kamenev
Heat transfer mediated by near-field fluctuations of the electromagnetic field was studied. In the case of metals, the latter are dominated by Coulomb interactions between thermal fluctuations of electronic density. It was shown that an elastic scattering of electrons, leading to a diffusive propagation of density fluctuations, results in a qualitative change of the radiation law. While the heat flux
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Adenine’s band strength at cryogenic temperatures Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 V. P. Rego, P. R. B. Oliveira, E. F. da Silveira
Infrared observations of the interstellar medium have unveiled the existence of numerous solid-phase molecules. The recent detection of uracil within the (162173) Ryugu asteroid has opened new prospects for the discovery of additional compounds, including nitrogenous bases, in the near future. To facilitate the comprehension, identification, and observation of these substances within astrophysical
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Transport signatures of plasmon fluctuations in electron hydrodynamics Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 Dmitry Zverevich, Alex Levchenko
In two-dimensional electron systems, plasmons are gapless and long-lived collective excitations of propagating charge density oscillations. We study the fluctuation mechanism of plasmon-assisted transport in the regime of electron hydrodynamics. We consider pristine electron liquids where charge fluctuations are thermally induced by viscous stresses and intrinsic currents, while attenuation of plasmons
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On non-local electrical transport in anisotropic metals Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 Graham Baker, Davide Valentinis, Andrew P. Mackenzie
We discuss various aspects of nonlocal electrical transport in anisotropic metals. For a metal with circular Fermi surface, the scattering rates entering the local conductivity and viscosity tensors are well-defined, corresponding to eigenfrequencies of the linearized collision operator. For anisotropic metals, we provide generalized formulas for these scattering rates and use a variational approximation
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The exotic ground state of the decorated honeycomb lattice Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 O. O. Kryvchikov, D. V. Laptiev
The study is focusing on the exploration of the magnetic properties of the frustrated decorated honeycomb lattices. The presence of geometrical frustration and C3 symmetry leads to an exotic ground state. Monte Carlo simulations and analytical calculations are used to analyze the system’s behavior. The dependence of the magnetization on the external field of the Ising model exhibits a step-like behavior
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Vibration spectra of benzene-like models with Hooke’s law interactions Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 M. M. Bogdan, O. V. Charkina, A. Y. Holovashchenko
The harmonic oscillations of a spring-ball model of benzene-like nanosystems with Hooke’s law interactions between nearest, second, and third neighbors are explored. We show that in the cylindrical coordinates the dynamics of this cyclic hexagonal system is described by the Lagrange equations similar to those of the one-dimensional two-component crystal model. We demonstrate that the vibration frequencies
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Two-dimensional electron gases as non-Newtonian fluids Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 Serhii Kryhin, Leonid Levitov
Two-dimensional electron systems offer an appealing platform to explore long-lived excitations arising due to collinear carrier scattering enabled by phase-space constraints at the Fermi surface. Recently it was found that these effects can boost excitation lifetimes over the fundamental bound set by Landau’s Fermi-liquid theory by a factor as large as (TF/T)α with α≈2. Long-lived degrees of freedom
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Thermal conductivity in one-dimensional electronic fluids Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 D. B. Gutman, I. V. Protopopov, R. Samanta, A. D. Mirlin
We study thermal conductivity in one-dimensional electronic fluids combining kinetic [R. Samanta, I. V. Protopopov, A. D. Mirlin, and D. B. Gutman, Thermal transport in one-dimensional electronic fluid, Phys. Rev. Lett. 122, 206801 (2019)] and hydrodynamic [I. V. Protopopov, R. Samanta, A. D. Mirlin, and D. B. Gutman, Anomalous hydrodynamics in one-dimensional electronic fluid, Phys. Rev. Lett. 126
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Hydrodynamic Navier-Stokes equations in two-dimensional systems with Rashba spin-orbit coupling Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 Edvin G. Idrisov, Eddwi H. Hasdeo, Byjesh N. Radhakrishnan, Thomas L. Schmidt
We study a two-dimensional (2D) electron system with a linear spectrum in the presence of Rashba spin-orbit (RSO) coupling in the hydrodynamic regime. We derive a semiclassical Boltzmann equation with a collision integral due to Coulomb interactions on the basis of the eigenstates of the system with RSO coupling. Using the local equilibrium distribution functions, we obtain a generalized hydrodynamic
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Dynamics of skyrmion contraction and expansion in a magnetic film Low Temp. Phys. (IF 0.8) Pub Date : 2023-12-13 Eugene M. Chudnovsky
Contraction and expansion of skyrmions in ferromagnetic films are investigated. In centrosymmetric systems, the dynamics of a collapsing skyrmion is driven by dissipation. The collapse time has a minimum on the damping constant. In systems with broken inversion symmetry, the evolution of skyrmions toward equilibrium size is driven by the Dzyaloshinskii–Moriya interaction. Expressions describing the
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Investigation of phase and structural states in nanocrystalline powders based on zirconium dioxide Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 V. P. Nerubatskyi, R. V. Vovk, E. S. Gevorkyan, D. A. Hordiienko, Z. F. Nazyrov, H. L. Komarova
The behavior of a polycrystalline body during sintering ZrO2 is determined not so much by the properties of individual particles but by the properties of aggregates, and the strength of the bonds between powder particles significantly affects the sintering process and the final properties of the ceramic composite materials. An increase in density and a uniform porosity distribution is achieved at such
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Oxygen diffusion in RBa2Cu3O7−δ superconductors: A brief review Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 I. L. Goulatis, R. V. Vovk, A. I. Chroneos
The interest in RBa2Cu3O7–δ (R = lanthanides) stems from its superconducting properties. These represent a very significant advance in solid-state materials physics and have been extensively studied for decades, with the aim of increasing the critical temperature by doping or external parameters such as pressure. In the present review, we briefly discuss oxygen diffusion in RBa2Cu3O7–δ with respect
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Transformation of the structure of the polyimide film during deformation: The effect of thickness Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 V. G. Geidarov, I. S. Braude, V. A. Lototskaya, Yu. M. Pohribna
The effect of the thickness of the amorphous polymerized films of poly-4,4'-diphenylene oxide pyromellitimide on the structure after deformation by stretching at 293 K and 77 K was studied. The evolution of the macromolecular structure was concluded based on the results of the redistribution of the intensity diffraction peaks. It was established that the structure of films with a thickness of 75 μm
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Electrical resistivity of coatings of quasicrystalline and crystalline phases of the Ti—Zr—Ni system in the temperature range 4–300 K Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 S. V. Malykhin, I. A. Kopylets, G. Ya. Khadzhay, V. V. Kondratenko, S. V. Surovitskiy, O. Yu. Devizenko, M. V. Kislitsa, Yu. S. Bogdanov, R. V. Vovk, S. S. Borisova
The temperature dependence of the electrical resistivity in the temperature range from 4.4 to 300 K for Ti41Zr41Ni18 (at. %) thin coatings of different crystal perfection and phase composition was studied. The coatings were deposited by magnetron sputtering with subsequent vacuum annealing in various modes ensuring the formation of several heterophase combinations, which included 1/1 and 2/1 approximation
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On the interplay of thermodynamic and structural properties of LiZn-based half-Heusler alloys Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 E. B. Ettah, Kseniia Minakova, M. E. Ishaje, Valentyna Sirenko
The half-Heusler LiZnX (X = As, P, and Sb) alloys have gained a significant attention due to their exceptional thermoelectric and magnetic properties, making them a promising material for various applications. In this study, we employ density functional theory to investigate the data on structural and thermodynamics properties of the LiZnX (X = As, P, and Sb) half-Heusler alloys. First-principles calculations
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Impact of ECAP processing on dislocation density and subgrain size in a ti6al4V alloy prepared by direct energy deposition Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 Z. Trojanová, S. Daniš, K. Halmešová, J. Džugan, Z. Drozd, K. Máthis, P. Lukáč, R. Z. Valiev
Ti6Al4V alloy billets were additively manufactured by direct energy deposition and then equal channel angularly pressed (ECAPed) at 700 °C. The originally prepared α′ martensite microstructure was completely converted to an equiaxed fine grain structure during ECAP processing. The α′ martensite decomposed into α + β dual phase structure. The dislocation density in the deposited and ECAPed samples was
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Peculiarities of obtaining nanocomposites with organic additives and consolidated nanomaterials with given properties Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 V. P. Nerubatskyi, E. S. Gevorkyan, R. V. Vovk, Z. Krzysiak, Z. F. Nazyrov, O. M. Morozova, D. A. Hordiienko
The work presents the results of the creation of consolidated nanomaterials and composite ceramics using modern methods of consolidation of ceramic materials for the synthesis of powder precursors and specified phases that self-reinforce ceramic matrices. The method of mechanosynthesis and electroconsolidation is used. The results of the use of these trends for the creation of promising composite materials
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Structure and cryogenic mechanical properties of severely deformed nonequiatomic alloys of Fe–Mn–Co–Cr system Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 E. D. Tabachnikova, T. V. Hryhorova, S. N. Smirnov, I. V. Kolodiy, Yu. O. Shapovalov, A. V. Levenets, S. E. Shumilin, I. V. Kashuba, M. A. Tikhonovsky, F. Spieckermann, M. J. Zehetbauer, E. Schafler, Y. Huang, T. G. Langdon
The work is devoted to a study of the structure and mechanical properties of two nonequiatomic medium-entropy nanocrystalline alloys, in which in a coarse state additional mechanisms act during plastic deformation — twinning (TWIP) in the Fe40Mn40Co10Cr10 alloy and phase transformations (TRIP) in the Fe50Mn30Co10Cr10 alloy. The nanocrystalline state in these alloys is achieved by high-pressure torsion
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“Metallization” of semimetals by an external electric field Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 Yu. I. Boyko, V. V. Bogdanov, Z. F. Nazyrov, R. V. Vovk, B. V. Grinyov
The paper considers the possibility of changing the energy spectrum of the electronic subsystem of semimetals from a non-degenerate to a degenerate state under the action of an external electric field. This “metallization” of semimetals is achieved by increasing the concentration of free electrons in the external field. The work also considers the possible transition of “metallized” semimetals to the
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Nonlinear effects at the deformation of amorphous polymers in warm and frozen states Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 V. D. Natsik, H. V. Rusakova
One of the important problems of the modern rheology of polymer materials, namely, the possibility of describing the deformation of amorphous polymers within the framework of linear rheological relationships between relative deformation and deforming stress or the need to use nonlinear rheological equations is considered. The criteria for distinguishing these approaches, namely, the determination of
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Low-temperature micromechanical properties of polyolephin/graphene oxide nanocomposites with low weight percent filler Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 H. V. Rusakova, L. S. Fomenko, S. V. Lubenets, V. D. Natsik, A. V. Dolbin, N. A. Vinnikov, R. M. Basnukaeva, S. V. Cherednichenko, A. V. Blyznyuk
The effect of small impurities of reduced graphene oxide (rGO) on microhardness of polyethylene (PЕ) and polypropylene (PP) matrices and the reaction of these nanocomposites and initial polymers on the influence of localized load in the temperature range of 77–295 K were studied. When rGO was introduced, PE practically did not change its properties, whereas the introduction of 0.3 wt% rGO into the
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Modulated distribution of vacancies within the post-irradiated bcc metals Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 O. V. Oliinyk, V. A. Tatarenko
The criterion of formation of a modulated structure by means of the spinodal mechanism in a spatial distribution of interacting vacancies (as strong concentrators of mechanical stresses) in metals as a target after irradiation is analyzed. For the irradiated body-centered cubic vanadium and tungsten, temperature dependences of the spatial periods of such a structure of the substitutional-vacancies’
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Mechanical properties of Al–Fe–Cr aluminum matrix composites in the temperature range 77–573 K Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 M. O. Iefimov, S. I. Chugunova, I. V. Goncharova, V. A. Goncharuk, A. A. Golubenko, K. E. Grinkevych, I. V. Tkachenko, O. I. Luk’yanov
The mechanical behavior of Al–Fe–Cr aluminum matrix composites strengthened by nanoquasicrystalline and/or crystalline phases was studied in the temperature range of 77–573 K. The strength characteristics and elongation to fracture during tensile tests of Al94Fe2.5Сr2.5Ti1, Al94Fe2Cr2Ti2, Al94Fe2.5Сr2.5Ti0.7Zr0.3 alloys were determined. It was established that the Al94Fe2Cr2Ti2 composite alloy has
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Low-temperature investigations of the physico-mechanical properties of solids and topical problems of cryogenic materials science: Studies in NSC kIPT NAS of Ukraine related to V. I. Startsev’s scientific activity (Review article) Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 V. I. Sokolenko
The review presents the most significant scientific results obtained at the NSC KIPT NAS of Ukraine during low-temperature studies of the physical and mechanical properties of a wide range of metals and alloys over the period from the second half of the 30 s of the 20th century to recent years. During this period, a school in the field of physics of strength and plasticity was formed at the Institute
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Creation of a heterogeneous grain structure is a condition for increasing the low-temperature ductility of nanocrystalline hcp metals Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 V. A. Moskalenko, A. R. Smirnov, R. V. Smolianets, Yu. M. Pohribna
The paper considers the influence of a heterogeneous (bimodal) grain structure on the ductility characteristics of commercial purity titanium in a wide range of low temperatures (4.2–395 K) as a strategy for optimizing mechanical properties within the framework of the “strength–plasticity” ratio. Using titanium as an example, the physical mechanism for increasing the low-temperature ductility of hcp
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Relaxation of the mechanical properties of polyimide films of the kapton H type during long-term exposure at ambient conditions Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 V. A. Lototskaya, L. F. Yakovenko
The influence of the exposure time in the initial state at room temperature, which is comparable to the time of operation in orbit (5, 8, and 10 years), on the mechanical properties of polyimide films of the kapton H type of different thicknesses and manufacturers under tensile conditions at room temperature was studied. A change in all studied characteristics (forced elasticity limit, fracture stress
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On the interaction of migrating {112¯6} twin boundary with nucleus of {101¯2} twin in Mg at T → 0 K Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 Ritu Verma, Andriy Ostapovets
Interaction between migrating {112¯6} twin boundary and nucleus of {101¯2} twin in magnesium is studied in a framework of computer simulations. It is demonstrated that {112¯6} boundary can be split into basal-prismatic interfaces during interaction. These basal-prismatic interfaces form new nucleus of {101¯2} twin, which coalesces with a pre-existed nucleus. Subsequent migration of {112¯6} boundary
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Unambiguous coupling between acoustic and electromagnetic emissions in plastically deformed crystals Low Temp. Phys. (IF 0.8) Pub Date : 2023-11-08 K. A. Chishko
An evident coupling between acoustic (AE) and electromagnetic (EME) emissions has been proved experimentally during plastic deformation of LiF ionic monocrystals under uniaxial compression with simultaneous recording of both AE and EME. The strong correlation between AE and EME demonstrate clearly that the observed EME is caused by dynamical dislocations and charged vacancies in the ionic lattice during
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High-frequency transport properties of a 2D electron gas with spin-orbit interaction under magnetic field driven topological transition Low Temp. Phys. (IF 0.8) Pub Date : 2023-10-11 Yu. A. Kolesnichenko, D. I. Stepanenko
We study the transport properties of a two-dimensional electron system with an essential spin-orbit interaction under topological phase transition due to changing in-plane magnetic field. We have analyzed the contribution of diagonal and off-diagonal components of density matrix with respect to number of spin zone in the high-frequency conductivity. Analytical formulas for the conductivity tensor have