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Low Temperature Physics
Journal Prestige (SJR): 0.264

Citation Impact (citeScore): 1
Number of Followers: 6

Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1063-777X - ISSN (Online) 1090-6517
Published by AIP

[28 journals]

Fractal analysis for low temperature physics
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  Authors: Leonid F. Chernogor, Oleg V. Lazorenko, Andrey A. Onishchenko
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 422-427, April 2023.
  A short review of existing methods of monofractal analysis proposed for low temperature physics investigations is presented. Based on the nature of the algorithms used, a new classification of modern monofractal analysis methods is proposed. The properties, the advantages and the disadvantages of these methods are considered. An important new concept of second-order fractals is introduced. Using the set of simple deterministic theoretical models of both the second-order fractal signals created especially for this and the traditional fractal signals, the results of their comparison based on the wavelet analysis are shown. The peculiarities of the second-order fractals are discussed.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:06Z
Formation of plasma density cavities caused by nonuniform stochastic
electric fields
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  Authors: N. A. Azarenkov, D. V. Chibisov
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 378-383, April 2023.
  The effect of depletion of the density of ions and electrons and the formation of a spatial cavity in a plasma-like medium due to inhomogeneous stochastic electric fields is considered. This effect is caused by collisions of charged plasma particles with random fluctuations of inhomogeneous electrostatic turbulence, as a result of which the particles are pushed out of the region with an increased level of fluctuations. To determine the final stationary distribution of the plasma density, the Fokker–Planck equation is used, the coefficients of which are determined from the equation of motion of particles in a stochastic electric field.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:05Z
Diffusion of the hydrogen in nanocrystalline vanadium films
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  Authors: A. Grib, M. Vitort, S. Petrushenko, S. Dukarov
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 415-421, April 2023.
  The β → α phase transition and diffusion of the hydrogen in nanocrystalline vanadium films were investigated. Films were deposited onto the glass substrate at the temperature 673 K and at room temperature. Transmission electron microscopy investigations of the structure of films showed that the averaged sizes of vanadium crystallites were 7 and 4 nm, respectively. The derivative of the electrical resistance of the saturated film revealed the broad β → α phase transition about 390 K. The diffusion coefficient of the hydrogen was obtained from the approximation of the time dependence of the increase of the electrical resistance of the non-saturated part of the film by an analytical expression. Values of the diffusion coefficient revealed the strong dependence on the concentration of the hydrogen. At small concentration of the hydrogen, the diffusion coefficient was equal to that in the bulk vanadium. At large concentrations of the hydrogen (above 20 at. %), the diffusion coefficient decreases by a thousand times. The activation energy of diffusion, calculated for samples with the large concentration of the hydrogen, is equal to (44.8 ± 0.8) kJ/mol [(0.464 ± 0.008) eV].
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:05Z
Creation and evolution of a “hotline” in superfluid helium
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  Authors: R. V. Vovk, K. E. Nemchenko
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 428-432, April 2023.
  The paper provides a theoretical consideration of the “hotline” phenomenon, a region with an increased phonon energy density, which occurs when two beams cross in helium. An analysis of the results of observations and a theoretical consideration of the formation of a “hotline” are carried out. The results of calculations are also compared with experimental data on the dependence of the “hotline” parameters on the power of the initial beams, and the angle between the directions of their movement.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:05Z
The study of homogeneity of the hexagonal Ti3AlC2 phase with inclusions of
the titanium carbide
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  Authors: A. Grib, S. Petrushenko, S. Dukarov, T. Prikhna, T. Serbenyuk
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 433-437, April 2023.
  Maps of spatial distributions of Ti, Al, and C on two surfaces of the Ti3AlC2 hexagonal phase (the so-called MAX phase) with inclusions of the TiC phase and Al2O3 were obtained by means of the energy-dispersive X-ray spectroscopy. Volume fractions of phases were 0.848, 0.107, and 0.045, respectively. The sample was cut from the synthesized tablet. One of the analyzed surfaces of the sample was the free outer surface of the tablet (surface 1), and another surface was the cut (surface 2). Histograms of the concentration distributions of elements were plotted. For both surfaces, histograms of all elements have Gaussian forms with mean values of about their stoichiometric concentrations in Ti3AlC2 and TiC phases. Histograms for the carbon have maxima at 34–36 at. %, which is close to the stoichiometric content of the carbon in the Ti3AlC2 MAX phase (33 at. %), and at about 50 at. % that corresponds to the stoichiometric concentration of the carbon in the TiC phase. However, Gaussian standard deviations from these mean values are large (up to 7 at. %), which proves the existence of th vacancies and interstitials of the carbon in phases. The histogram for the aluminum on surface 1 has an additional distribution near zero value of the concentration, and the histogram for carbon on surface 2 has an additional distribution near 27.7 at. %. Both found particularities can be explained by supposing that the outer surface of the original tablet cools down more rapidly than its inner parts.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:05Z
V. G. Khotkevych. His way in science
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  Authors: V. V. Khotkevych, R. V. Vovk
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 375-377, April 2023.
  
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:04Z
Effect of pressure on the scattering of electrons by phonons in niobium
triselenide at low temperatures
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  Authors: V. I. Biletskyi, G. Ya. Khadzhai, M. V. Kislitsa, Z. F. Nazyrov, R. V. Vovk
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 493-497, April 2023.
  The paper analyzed the data on the temperature dependence in the region 4.2-300 K of the electrical resistance along the direction of the highest conductivity of the NbSe3 single crystal at different values of the uniaxial pressure perpendicular to the indicated direction. This pressure suppresses the charge density wave states without shifting their temperatures. In regions of metallic conductivity, the resistance can be approximated within the framework of the Bloch- Gruneisen-Wilson model. The Debye temperature decreases due to the size effect, which is stimulated by both cooling and pressure.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:04Z
Investigation of the effect of silicon carbide nanoadditives on the
structure and properties of microfine corundum during electroconsolidation
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  Authors: V. P. Nerubatskyi, R. V. Vovk, M. Gzik-Szumiata, E. S. Gevorkyan
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 498-504, April 2023.
  The effect of nanodisperse powders on the microstructure and properties of corundum was studied. The microstructures of composites under different modes of electroconsolidation are considered. The phase composition and some mechanical properties of the composite materials obtained by the electrosintering method were determined. A comparative assessment of the properties is provided and recommendations are formulated for further improvement of the physical and mechanical properties of Al2O3–SiC composites, where silicon carbide nanopowders are used as additives.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:04Z
Thermodynamic features of the synthesis of high-density ceramic-metal
materials “chromium oxide–chromium” from mixtures “chromium
oxide–carbon” in the process of hot pressing
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  Authors: E. S. Gevorkyan, V. P. Nerubatskyi, R. V. Vovk, T. Szumiata, D. A. Hordiienko, M. Gzik-Szumiata
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 384-391, April 2023.
  Obtaining ceramic-metal materials Cr2O3–Cr by reduction of chromium with carbon in the process of hot pressing makes it possible to get high-density materials for various functional applications. The thermodynamical study of the interaction of chromium oxide with carbon (soot) is of particular interest, since not only reduced chromium is formed during the synthesis, but also chromium carbides with different stoichiometry, which makes it possible to increase the density and, consequently, the strength of the composite as a whole. Using the partial reduction of chromium oxide with carbon, it is possible to synthesize ceramic-metal materials “chromium oxide–chromium” with different chromium content. The degree of occurrence of this reaction depends on the content of carbon monoxide in its products by lowering the concentration of the obtained pure chromium. This method enables obtaining a ceramic-metal material Cr2O3–22 wt% Cr of eutectic composition, which is characterized by special physical and mechanical properties.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:03Z
Localization of electrons in the field of impurity atoms on the surface of
a nanotube
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  Authors: Georgiy I. Rashba
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 392-397, April 2023.
  The localization of electrons in the field of isolated nonmagnetic impurity atoms on the surface of a nanotube is considered. A model of a Gaussian separable impurity potential capable of localizing an electron at any intensity is used. The positions of the local level are found. The positions of the resonances are found, their widths are estimated. It is shown that the positions of the resonances experience oscillations similar to the de Haas–van Alphen oscillations, when changing the radius of the tube.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:03Z
The effect of long-term exposure at room temperature on the thermal
conductivity of the FeSe superconductor in the normal state
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  Authors: G. Ya. Khadzhai, A. L. Solovjov, M. V. Kislitsa, L. A. Paschenko, E. Nazarova, K. Buchkov, S. R. Vovk, A. Feher, R. V. Vovk
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 404-407, April 2023.
  The temperature dependence of the thermal conductivity of the iron-based FeSe0.94 superconductor sample has been studied in the range of 4.2–200 K after long-term exposure for 7 years. The temperature dependence of thermal conductivity is predominantly phonon. This dependence was approximated taking into account phonon scattering by the boundaries of the sample, as well as scattering by dislocations, point defects, and phonon-phonon scattering. When comparing the parameters of this approximation with similar parameters for literature data for a freshly prepared polycrystalline sample, it turned out that long-term exposure led to a significant increase in all parameters. That is, long-term exposure causes a significant increase in the number of dislocations, and point defects and intensifies phonon-phonon scattering. For both samples, we found no effect of the structural phase transition at T ≈ 75 K from the tetragonal phase into the orthorhombic one on the thermal conductivity.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:03Z
Investigation of the features of blade processing of steels with ceramic
composites based on chromium oxide
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  Authors: E. S. Gevorkyan, V. P. Nerubatskyi, R. V. Vovk, O. Y. Zinchenko, H. L. Komarova, L. V. Voloshyna
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 398-403, April 2023.
  An overview of modern cutting ceramic composite materials and possible methods of their production was conducted. An example of the use of composite ceramic materials based on chromium oxide Cr2O3 in blade processing is presented, which makes it possible to improve the quality of processing of the surface layer of steel parts of different hardness. Features of structure formation and properties of the developed cutting material are presented, which, under certain cutting modes, shows higher wear resistance compared to common cutting materials based on aluminum oxide. The effectiveness of dispersed strengthening of the chromium oxide matrix with fine-grained carbides and nitrides of refractory metals is shown.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:02Z
“Elastic” and “inelastic” twins and pinning of magnetic flux lines
(vortices) in single crystals YBa2Cu3O7–x
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  Authors: Yu. I. Boyko, V. V. Bogdanov, N. R. Vovk, A. O. Komisarov, Junyi Du, Z. F. Nazyrov, A. V. Samoylov, E. S. Gevorkyan, R. V. Vovk
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 408-414, April 2023.
  In this work, we studied the fixation of magnetic vortices (pinning effect) on “inelastic” and “elastic” twins, whose wedge-shaped peaks in the direction of twinning do not reach the crystal surface. The effectiveness of the “elastic” twins effect as pinning centers was studied by measuring of the critical transport current Jc in single crystals YBa2Cu3O7–x. The presented experimental data indicate that the “elastic” twins boundaries are effective pinning centers of the magnetic flux lines in single crystals of the compound under study. The main pinning centers of the vortices are dislocation clusters forming at the vertices of the “elastic” twins. The dislocation lines are located in the twin plane and, if the orientation of the magnetic vortices and dislocation lines coincide, the energy of the vortices decreases, the pinning force appears, fixing their location, which ultimately leads to an increase in the critical density of the transport electric current.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:01Z
Investigation of the temperature behavior of the vibrational spectrum of
the (CuSO4)(C2H8N2) · 2H2O organometallic crystal by Raman
spectroscopy
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  Authors: A. V. Vankevich, V. P. Gnezdilov, I. A. Taranova
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 461-466, April 2023.
  In the paper, the temperature behavior of the vibrational spectrum of the [math] crystal has been analyzed by Raman scattering. At a temperature of about 70 K the appearance of new lines was detected in the Raman spectra. The appearance of additional lines is associated with the fixation of the torsional vibration of the ethylenediamine chelate ring. Such a fixation testifies to the implementation of an order–disorder structural phase transition in these crystals. A model of the mechanism of the phase transition in the [math] crystal involving the chelate ring of ethylenediamine is proposed.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:00Z
Effect of deuteration on the vibrational spectrum of the Cu(en) (D2O)2SO4
crystal
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  Authors: A. V. Vankevich, V. P. Gnezdilov, I. A. Taranova
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 473-476, April 2023.
  This work investigated the vibrational spectrum of the deuterated organometallic crystal Сu(еn) [math] in a wide range of frequencies and temperatures. Results indicated that deuteration leads to a change of hydrogen not only in the water molecule, but also in the [math] molecule of the ethylenediamine ring. It was found that deuteration of the crystal disrupts the phase transition observed in the pure crystal.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:52:00Z
Special features of low-temperature microwave ferromagnetic resonance in
nanometer ferrite layer patterned by macroporous silicon substrate
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  Authors: A. S. Vakula, S. Yu. Polevoy, K. Yu. Sova, S. V. Nedukh, A. A. Girich, S. I. Tarapov
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 467-472, April 2023.
  Experimental magnetic resonance spectra for nanometer ferrite brand 1SCh4 layer deposited on macroporous silicon substrate, obtained at T = 300 and 4.2 K in the frequency ranges of 5–15 and 60–75 GHz, respectively, were analyzed. In addition to the ferromagnetic resonance mode, additional peaks were found in the magnetoresonance spectra. An analysis using the known theoretical concepts of the modern spin dynamic theory, together with the results of micromagnetic simulation, showed the formation of spin-wave oscillation modes that arise due to the structurization of the ferrite layer by a substrate of macroporous silicon.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:51:59Z
Lanthanide doping and external parameters in RBa2Cu3O7–δ
superconductors: A brief review
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  Authors: Ioannis Goulatis, Alexander Chroneos
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 486-492, April 2023.
  The invention of superconductivity was a major advance of solid state physics. In the present review, we briefly discuss the emergence of RBa2Cu3O7–δ (R are lanthanides). In the first part, we consider the impact of lanthanide doping and the intricacy of the praseodymium anomaly. In the second part, we discuss the impact of external parameters such as pressure and electron irradiation on the critical superconducting parameters. This brief review concludes with future perspectives of the field, considering recent advances.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:51:58Z
Evolution of the pseudogap and excess conductivity of YBa2Cu3O7–δ
single crystals in the course of long-term aging
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  Authors: A. L. Solovjov, L. V. Bludova, M. V. Shytov, S. N. Kamchatnaya, Z. F. Nazyrov, R. V. Vovk
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 477-485, April 2023.
  The temperature dependences of both fluctuation conductivity (FLC) σ′(T) and pseudogap (PG) Δ*(T) derived from measurements of resistivity ρ(T) of an optimally doped YBa2Cu3O7−δ single crystal subjected to long-term storage have been studied. The as-grown sample S1 exhibits characteristics typical of optimally doped YBa2Cu3O7−δ single crystals containing twins and twin boundaries. Analysis of both FLC and PG showed an unexpected improvement in all characteristics of the sample after 6 years of storage (sample S2), indicating that the effect of twin boundaries is somehow limited. After 17 years of storage, all characteristics of the sample changed dramatically, which indicates a strong influence of internal defects formed during the aging process. For the first time, the temperature dependences of both FLC and PG were obtained after 17 years of storage.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:51:57Z
The energy spectrum and low-temperature magnetic properties of the
decorated two-leg mixed spin ladder
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  Authors: V. O. Cheranovskii, E. V. Ezerskaya, A. O. Kabatova
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 438-442, April 2023.
  The energy spectra and low-temperature magnetic properties of two one-dimensional Heisenberg mixed spin (s = 1, 1/2) systems, namely decorated two-leg mixed spin ladders with the lattice topology of polyacene, are studied. The gapless character of the exact excitation energy spectra for both ladder models has been determined. We found numerically that the model with macroscopic ground state spin S0 has gapped excitations with the spin S > S0. This leads to the appearance of an intermediate plateau in field dependence of magnetization at low temperatures. We have shown that the ladder with equal coupling in legs has the maximal size of this plateau at the same coupling in rungs. For a mixed spin ladder model with Ising interactions in legs, the appearance of two intermediate magnetization plateaus at low temperatures and some values of coupling parameters was shown.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:51:56Z
Inversion of the temperature coefficient of resistance of chromium films
as the result of their nanocrystalline structure
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  Authors: O. O. Nevgasimov, S. I. Petrushenko, S. V. Dukarov, V. M. Sukhov
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 443-447, April 2023.
  The temperature dependence of the resistance of chromium films obtained by the thermal deposition on a substrate at room temperature was studied. It is shown that the most probable crystallite size in as-deposited films is 9 nm and increases by about 15% after the first annealing. According to the results of resistive studies, the structure formed after the first heating is stable and changes slightly during thermal cycling. It has been found that up to a temperature of approximately 200 °C, the temperature coefficient of resistance of the samples is negative and amounts to approximately −2 · 10−4 K−1. With a further increase in temperature, the temperature coefficient of resistance becomes positive, but remains significantly lower than the value corresponding to chromium in the bulk state. The observed effects are explained by the nanocrystalline structure of the samples.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:51:56Z
Effect of “pseudorotation” on cyclopentane isochoric thermal
conductivity
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  Authors: V. P. Revyakin, M. G. Revyakina, G. V. Revyakin
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 448-452, April 2023.
  The isochoric heat conductivity in plastic phases I and II solid cyclopentane(C5H10) is investigated. Various temperature dependents of heat conductivity indicate various characteristics of a rotary motion of molecules in these phases. In phase II, the motion of the molecules has mainly character of libration, and in phase I, is close to the hindered rotation. In a phase I of cyclopentane an increase in the slope of isochoric heat conductivity with the growth of the density of samples is revealed. Such behavior of heat conductivity is not characteristic of molecular crystals and can point to a contribution of “pseudorotation” to heat transfer. In phase II, cyclopentane the behavior of heat conductivity is close to a case of strong scattering of phonons.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:51:55Z
Feature of electric resistance dependence on temperature for
hydroxyapatite
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  Authors: K. I. Sokol, D. V. Rokhmistrov
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 453-456, April 2023.
  Electrical resistance of hydroxyapatites in an interval from room temperature to 1200 °C have been studied. It is shown that the resistance of hydroxyapatite depends sufficiently from the impurities. To identify the impurities, XRD, IR, MS measurements were carried out. It was established that the electrical resistance of hydroxyapatite is related to the water content in the samples, nitrous substances and carbonate ions located inside of hydroxyapatite crystal lattice. Energy activation of electrical conductivity in hydroxyapatite is calculated.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:51:55Z
Electric characteristics of calcium-phosphate ceramics with impurities
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  Authors: R. V. Vovk, K. I. Sokol
  Abstract: Low Temperature Physics, Volume 49, Issue 4, Page 457-460, April 2023.
  The electrical characteristics of calcium phosphate materials have been studied at various frequencies in the temperature interval from room temperature to 1200 °C. It has been shown that the electrical characteristics (relative permittivity, capacitance, and electric resistance) change with the annealing temperature. Temperature changes in these characteristics are associated with the presence of impurities in the studied samples, as well as the nonstoichiometry of the phase composition of the initial samples. The phase composition and structure of the studied samples were studied by X-ray diffraction, Mass-spectrometry, and IR-spectroscopy. It has been shown that the studied calcium-phosphate samples have dielectric properties. The temperature intervals for the stability of the electrical characteristics of these materials have been established.
  Citation: Low Temperature Physics
  PubDate: 2023-04-12T02:51:55Z