Abstract The paper discusses the features of supercooled water thin film of width d = 3.97 nm contained by the perfect graphene layers and crystallizing under external stationary electric field. It was found that the electric field applied perpendicular to graphene layers impedes structural ordering, while the electric field applied in lateral direction contributes to formation of the cubic ice (Ic)

Abstract The specific heat and the magnetocaloric effect of intermetallic LaFe11.2 – xMnxCo0.7Si1.1 (x = 0, 0.1, 0.2, 0.3) compounds have been measured in the temperature range 80–300 K in magnetic fields up to 8 T. The magnetocaloric effect (MCE) is estimated by two methods: the direct method in cyclic magnetic fields and also indirect method from the data on the specific heat. An increase in the

Abstract The thermal diffusivity and thermal conductivity of multiferroics Bi1 – xHoxFeO3 (x = 0–0.20) have been studied in the high-temperature region of 300–1200 K. It is established that alloying with the rare-earth element (holmium) strongly increases the specific heat in a wide temperature range T > 300 K and significantly changes temperature anomalies of the thermal diffusion and thermal conductivity

Abstract Amorphous metallic foams are prospective materials due to unique combination of their mechanical and energy-absorption properties. In the present work, atomistic dynamics simulations are performed under isobaric conditions with the pressure p = 1.0 atm in order to study how cooling with extremely high rates (5 × 1013–5 × 1014 K/s) affects the formation of pores in amorphous titanium nickelide

Abstract The direct measurements of the magnetocaloric effect ΔTad in the Heusler alloy Ni49.3Mn40.4In10.3 have been carried out in cyclic magnetic fields with amplitudes to 8 T. The maximum values of the magnetocaloric effect are 5.29 K in the martensite–austenite transition region and 3.39 K in the region of the magnetic phase transition in the austenite phase. A long-term action of a cyclic magnetic

Abstract The thermodynamic properties of the models of magnetic dendrimers were studied by the Monte Carlo method. The system state density is calculated; the ground state structures are determined. The temperature dependences of magnetization m, entropy S, internal energy E, and heat capacity C are calculated. It is shown that in the investigated model of dendrimer, the effect of the surface sites

Abstract The interaction of an electromagnetic radiation with electric dipole active spin modes in a multisublattice antiferrodielectric is shown to possibly lead to anomalous (negative) spatial shift of a light beam when an electromagnetic wave is incident on the interface with an isotropic dielectric medium.

Abstract The Monte Carlo method is used to study phase transitions in disordered two-dimensional Potts models in which disorder is realized as nonmagnetic impurities. The temperature dependences of the thermodynamic parameters have been calculated for specific heat C, susceptibility χ, and fourth-order Binder cumulants in the dependence on spin concentration p. The calculations have been performed

Abstract In Sr9 – xMxTm(VO4)7 system, solid solutions with M = Ca (0 ≤ x ≤ 2) and M = Pb (0 ≤ x ≤ 1) have been prepared by solid-phase synthesis at 1373 K. At room temperature, the single-phase samples are isostructural to the Ca3(VO4)2 ferroelectric (space group R3c, Z = 6). The materials have been characterized by methods of the X-ray phase analysis (XPA), the second harmonic generation (SHG), and

Abstract Phosphate solid solutions based on the whitlockite family Ca9 – xMxDy(PO4)7 (M = Zn2+ or Mg2+) have been obtained. The samples have been investigated by a combination of the methods, such as X‑ray diffraction analysis, second optical harmonic generation, and luminescence spectroscopy. It is established that the unit-cell symmetry change (R3c → \(R\bar {3}c\)) in the solid-solution series with

Abstract Within the variational spin density functional method, the description of the temperature and ferromagnetic ordering effects on the adsorption of atoms of transition metals placed on paramagnetic substrates at formation of a monolayer film of FexNi1 – x alloy depending on the alloy component concentration and the coating parameter θ has been accomplished for the first time. The influence of

Abstract The results of investigation of functional characteristics of the Mn2NiGa Heusler alloy prepared by argon-arc melting are presented. Its electric resistance, magnetization, magnetocaloric and shape memory effects were studied using direct experimental techniques in a wide temperature range 100–400 K. The inverse magnetocaloric effect, which does not reach saturation in pulsed magnetic fields

Abstract The temperature–frequency spectra of the complex dielectric permittivity of the LuFe2O4 multiferroics have been studied in the temperature range 100–400 K at frequencies 20 Hz–120 MHz. It is found that the temperature coefficient of the dielectric permittivity changes its sign and the ac conductivity has maxima and minima in the temperature range ~150–350 K and in the frequency range ~30–120

Abstract Several complex theories explaining the phenomenon of negative magnetoresistance (NMR) are discussed, observed in insulating diluted granular multilayers Co80Fe20(t)|Al2O3. In fact, this investigation is re-analyzing the experimental measurements of Co80Fe20 with low nominal thickness t = 0.7 nm of granular layers obtained earlier. Two theories such as quantum interference model and localized

Abstract We synthesized diamond particles with germanium-vacancy color centers on a germanium substrate by hot-filament chemical vapor deposition. The formation of color centers occurred during the growth of diamond particles by the introduction of germanium atoms formed by the etching of a crystalline germanium wafer with atomic hydrogen. The conditions of the vapor phase deposition, which affect

Abstract The magnetic and magnetocaloric properties of Heusler Ni2 + xMn1 – xGa alloys (x = 0.16, 0.18, and 0.3) have been studied using a model based on the Malygin theory of smeared phase transitions, the Bean–Rodbell theory of first-order phase transitions, and the mean-field theory. The temperature dependences of strain, magnetization, and isothermal change in entropy of these alloys have been

Abstract The features of the composition, crystal, and magnetic structure of Ti-substituted barium hexaferrite BaFe12 – xTixO19 (0.25 ≤ x ≤ 1.5) are studied by Mössbauer spectroscopy, vibration magnetometry, X-ray diffraction, and simultaneous thermal analysis. Bounded heterovalent isomorphism implemented by the scheme 2Fe3+ → Ti4+ + Fe2+ while retaining the charge balance is established when Fe3+

Abstract A numerical Monte Carlo study has been performed on the influence of various initial states, easy-axis-type magnetic anisotropy, and structural defects on a nonequilibrium critical behavior of the classical three-dimensional Heisenberg model. An analysis of the time dependence of the magnetization and the autocorrelation function for the isotropic Heisenberg model shows substantial influence

Abstract Influence of hydrogenation on the microstructural parameters, surface topology, and temperatures of magnetic phase transitions in Dy2Fe10Al7 was studied. Thermomagnetic properties in the obtained hydride Dy2Fe10Al7H3.2 were also investigated. Hydrogenation was found not to change the Curie point of the compound Dy2Fe10Al7, but at the same time it affects remarkably the temperature of the magnetic

Abstract A vortex system of the Bi-2212 superconductor in an external magnetic field linearly increasing at different rates has been numerically simulated using the Monte Carlo method. The effect of the concentration and distribution of pinning centers on the penetration of the magnetic flux has been studied. Features of the flux penetration have been observed and described in terms of the vortex system

Abstract The structural and physical properties of Cu90 – xFexPd10 ternary alloys with x = 5, 10, 15, and 20 are studied using X-ray diffraction, resistivity measurements, Vickers hardness tester, and tensile testing machine. The samples were prepared by using arc-melting furnace under an atmosphere of purified Argon. The integrated intensity data obtained from X-ray diffraction are used to determine

Abstract The Y0.4Bi0.6VO4 and Y0.6Bi0.4VO4 solid solutions two-phase at xBi = 0.95, 0.90, and 0.80 have been formed by the solid-phase synthesis from the initial Y2O3, Bi2O3, and V2O5 oxides burned in air at a temperature of 1173 K for 200 h and their high-temperature heat capacity has been measured in the range of 350–1000 K by differential scanning calorimetry. The thermodynamic properties of the

Abstract The phase diagram of two-dimensional systems with continuous symmetry of the vector order parameter containing defects of the “random local anisotropy” type is investigated. In the case of a weakly anisotropic distribution of the easy anisotropy axes in the space of the order parameter, with decreasing temperature, a smooth transition takes place from the paramagnetic phase with dynamic fluctuations

Abstract The specific features of a phase transition in a thin ferroelectric film in an external electric film have been studied in terms of the Landau–Ginzburg–Devonshire phenomenological theory in the dependence on the film thickness and the type of polarization pinning on its surface. The phase transition mechanism is found to be changed in an electric field. The phase transition shifts in temperature

Abstract The effect of rare-earth ions (R = Er3+, Tb3+, and Ce3.75+) on the dielectric properties and the electric polarization induced by local polar phase separation domains in solid solutions of R0.8Ce0.2Mn2O5 (R = Er, Tb) multiferroics has been studied. These parameters are found to qualitatively differ from those of initial RMn2O5 (R = Er, Tb) crystals studied before. It is shown that the properties

Abstract The current transport mechanisms in Au|Pt|n-GaN Schottky barrier diodes are investigated in a temperature range of 40–325 K. The calculated barrier height and ideality factor are 1.12 and 2.13 eV, respectively, and it is observed that the barrier height Φb increases and the ideality factor n decreases with temperature increase. The apparent barrier height and the ideality factor derived by

Abstract The regularities of statistical distributions of breaking strength of high-strength ultraoriented monofilaments and polyfilament fibers consisting of several hundreds single ultrahigh-molecular-weight polyethylene (UHMWPE) fibers were analyzed using the Weibull and Gauss models based on a large array of measurements (50 identical samples in each series). It was shown that the distribution

Abstract The structural, electronic, and nonlinear optical properties of a γ-TeO2 crystal have been studied using nonempiric quantum-mechanical calculations. The electron localization on the 5d orbital is taken into account using the Hubbard corrections to the density functional (the LDA + U approximation). The use of this approach enables a fairly correct reproducibility of the experimental structural

Abstract The temperature changes in the crystal lattice parameters a(T) of cadmium and strontium fluorides and also of their mutual Cd1 – xSrxF2 (x = 0.23, 0.50) solid solutions has been studied experimentally at temperatures 5–300 K. The temperature dependences of the unit cell volume of these fluorides are analyzed in the Debye–Einstein model. The lattice vibration anharmonicity of the solutions

Abstract A dislocation glide mechanism at low temperatures is proposed. The mechanism is based on the inclusion of dynamic atomic displacements, i.e., those caused by nonadiabatic transitions of atoms in a crystal with a dislocation under action of an external force. The dynamic displacements initiate the instability of a rectilinear dislocation with respect to low-amplitude displacements during atomic

Abstract The temperature dependences of the Seebeck coefficient, the electrical conductivity (T = 300–873 K) and also the heat conductivity coefficient, and the thermoelectric figure of merit (T = 300–770 K) of polycrystalline samples of solid solutions based on gadolinium and dysprosium sulfides of compositions γ‑GdxDy1 – xS1.49 (x = 0.1, 0.2, 0.3, 0.4) have been studied. It is found that the morphological

Abstract Based on calculations within the density functional theory and an analysis of low-temperature photoluminescence spectra, the structure of electron–hole liquid in shallow Si/Si1 – xGexSi (100) quantum wells 5 nm wide with germanium content x = 3–5.5% is studied. It is shown that the energy of quasi-two-dimensional electron–hole liquid localized in quantum wells for this composition range as

Abstract Specific features of thermal emission from charge localization centers to an electrically inhomogeneous TlGaSe2 crystal have been studied. Inhomogeneities were formed during preliminary polarization of the sample at a low temperature of the ferroelectric state of the crystal. The results obtained are in good agreement with the specific features of recording of the thermal emission of localized

Abstract The random matrix theory is used to describe the vibrational properties of two-dimensional disordered systems with a large number of degrees of freedom. It is shown that the correlated Wishart ensemble allows one to take into account the most significant mechanical properties of amorphous solids. In this ensemble, an excess density of vibrational states in comparison with the Debye law is

Abstract— The results of the study of the peculiarities of changes in the electrophysical, optical, and plasmonic properties of ultrathin metallic films during the percolation transition from an islet structure to a continuous one have been presented. It has been shown that the change in electrical conductivity of thin Ti and Pt films above the percolation threshold during their condensation can be

Abstract The specific features of phase transitions in elastostressed Al–Ga–In–Sb–Bi heterosystems and In–Sb–Bi and Al–In–Bi subsystems are discussed. The isotherms of this heterosystem and its subsystems are studied in the temperature range 653–923 K. The critical temperatures and the coordinates of the critical points of the spinodal decomposition of the AlGaInSbBi solid solution have been determined

Abstract Temporal instability of acoustic wave is investigated in an infinite semiconductor plasma using classical hydrodynamic approach. We consider a homogeneous semiconductor placed in an external magnetic field. Dispersion and gain characteristics of acoustic wave generated in a piezoelectric semiconductor plasma medium with momentum mismatched situation are examined. Numerical analysis of qualitative

Abstract Based on the results of in situ electron diffraction study of the solid-state reaction and electrical resistivity measurements on the Al/Ag thin films with an atomic ratio of Al : Ag = 1 : 3, the temperature of the reaction onset has been established and a model of the structural phase transitions has been proposed. The solid-state reaction begins at 70°C with the formation of the Al–Ag solid

Abstract The anisotropy of magnetization of microwires consisting of an α-Fe core and a (PrDy)(FeCo)B shell is studied at 300 K. The components of α-Fe core magnetization directed along the microwire axis and the noncollinear component of the microwire shell with different magnetization saturation fields of ~100 Ое and >10 kOe, respectively, are separated. The difference between the directions of magnetization

Abstract The effect of La concentration on the kinetic character of the induced phase transition in PbMg1/3Nb2/3O3–25PbTiO3 ferroceramics is studied. Below the Vogel–Fulcher temperature, the time variations of the permittivity and optical transmittance in electric fields 0 < E < 6 kV/cm are analyzed. It was found that, in an electric field, in La-containing transparent ceramics, the permittivity and

Abstract Magnetic properties of two-phase granular semiconductor–ferromagnet GaSb–MnSb films obtained by pulsed laser deposition as a function of growth temperature and postgrowth annealing were stu-died.

Abstract The effect of an external magnetic field on the phase transitions and the thermodynamic and magnetic properties of the three-dimensional antiferromagnetic Ising model on a body-centered cubic lattice has been studied using a replica algorithm of the Monte Carlo method, taking into account the interactions of next nearest neighbors. A phase diagram of the dependence of the critical temperature

Abstract The SmGaGe2O7 oxide material has been obtained from initial Sm2O3, Ga2O3, and GeO2 oxides by solid-phase synthesis with annealing in air in the temperature range of 1273–1473 K. The structure of the investigated germanate (sp. gr. P21/c, a = 7.18610(9) Å, b = 6.57935(8) Å, and c = 12.7932(2) Å) has been established by X-ray diffraction and the high-temperature heat capacity has been determined

Abstract The results of studying the absorption spectra of C60 polymer–fullerene composites are presented. In the composite polymethylmethacrylate–C60, a gradual process of aggregation of the fullerene upon heating is recorded. This made it possible to determine the diffusion coefficient of C60 molecules in this polymer. The difference in the absorption spectra of C60 clusters in different composites

Abstract The influence of the skin effect and active loss in a semiconductor composite with a wide range of the values of the conductivity on the intensity of EPR absorption lines has been studied. An approach that enables one to obtain adequate agreement of the calculated and experimental results has been proposed. The absorption line intensity corresponding to the unit volume is shown can decrease

Abstract We studied the optical spectra of fluorinated yttrium–aluminum compositions activated by Eu3+ ions. The compositions were synthesized by thermal decomposition at 800°C of fluorine-containing complexes of yttrium, europium, and aluminum nitrate, isolated as sols from ethyl acetate (EA). The main phases of the compositions are (Y1 – xEux)OF and (Y1 – xEux)AlO3. Photoluminescence is associated

Abstract The development of new dielectric materials for insulating layer of interconnects with low loss on high frequencies (low-k) is one of main directions of modern microelectronics. At present, various modifications of SiO2-based dielectric structures standard for modern integrated circuits differ in composition and morphological characteristics are being studied. In this work, the dielectric

Abstract In this paper, we present a detailed study of the critical behavior around paramagnetic–ferromagnetic phase transition in the nominal composition La0.65Bi0.05Sr0.3Mn1 – xGaxO3 (x = 0 and 0.06). Our powder specimens were synthesized using the conventional solid-state reaction method and analyzed by X-ray diffraction and magnetic measurements. X-ray diffraction analysis at room temperature shows

Abstract A model of the energy diagram is proposed for graphene (Gr) monolayer formed on a magnetic transition metal (MTM). The regimes of the strong and weak Gr–MTM coupling are considered; the analytical expressions have been derived for the magnetization induced by a substrate in epitaxial graphene in these regimes. It is shown that, in the strong coupling regime, a quasi-local state gives the main

Abstract The Fe3O4/CoFe2O4 nanoparticles with a core–shell structure with an average size of 5 nm have been obtained by codeposition from the iron and cobalt chloride solutions. An analysis of the magnetic properties of the obtained system and their comparison with the data for single-phase Fe3O4 (4 nm) and CoFe2O4 (6 nm) nanoparticles has led to the conclusion about a noticeable interaction between

Abstract The structural, electronic, and optical properties of Be0.25Zn0.75O alloy as a function of the pressure have been investigated by using the first-principles density functional theory within the generalized gradient approximation. The results show that the lattice constants decrease and the band gap increases with increasing pressure. The valence band maximum (VBM) moves to lower energy, whereas

Abstract The structural, thermal, static magnetic, and resonance properties of the low-dimensional NaCuFe2(VO4)3 compound obtained by the solid-phase synthesis have been investigated. In the temperature range of 110–300 K, the electron spin resonance in the X band with a g factor of 2.008 has been detected. The magnetic properties of a sample with a high frustration level in the paramagnetic, antiferromagnetic

Abstract The metallic ion components of the absorption energy of Ga and Cl atoms on C and Si faces of p- and n-SiC have been calculated in the framework of the Haldane–Anderson model. It is shown, first, that the ion contribution is higher than the metallic contribution in all cases under consideration. Second, the binding energy of Ga adatoms during adsorption on p-SiC is higher than that of Cl adatoms

Abstract The influence of defects of the “random local field” type with an anisotropic distribution of random fields on two-dimensional models with continuous symmetry of the vector order parameter is considered. In the case of weak anisotropy of random fields, with decreasing temperature there takes place a smooth transition from the paramagnetic phase with dynamic fluctuations of the order parameter

Abstract Results of numerical simulation and experimental data on recording azimuthal angular dependences of a second-harmonic signal reflected from CdxHg1 – xTe structures and GaAs substrates at normal incidence of probe laser radiation on the sample and azimuthal rotation of its polarization plane have been compared. It is found proceeding from the results of studying (013)GaAs substrates and CdTe|ZnTe|GaAs

Abstract Electrodeposition of cobalt on monolayer graphene synthesized by chemical vapor deposition produces Co–CoO/graphene composite structures, which is accompanied by increases in the electrical resistance and magnetoresistance. We show that the observed magnetoresistance effect is caused by two competing contributions: negative (NMR) and positive (PMR) magnetoresistance. In weak magnetic fields

Abstract The structural factors that lead to a decrease in the mechanostability of ultrafine-grained (UFG) metals and alloys during creep tests at increased temperatures have been revealed using small-angle X-ray scattering, electron microscopy, and the measurements of the density. An important factor is found to be nanopores that form during severe plastic deformation. The development of these nanopores

Abstract The paper presents a numerical study, within a nonlinear generalization of the classical Ericksen–Leslie theory, of a new nonlinear mechanism for the formation of the regime of shock pressure on the boun-ding walls of a microsized twisted nematic cell (TNC), realized in the form of the kinklike traveling wave \(\mathcal{P}\)(z – \({v}t\)) under the effect of the externally applied electric

Abstract The electronic structure of magnetically doped topological insulator Bi1.09Gd0.06Sb0.85Te3 is studied in the vicinity of the Dirac point at various temperatures (above and below the Néel temperature, 1–35 K) and synchrotron radiation polarizations using angle-resolved photoelectron spectroscopy. It is shown that the energy gap exists in photoemission spectra at the Dirac point, which remains

Abstract The effect of rare-earth ions (R = Er3+, Tb3+) with strong spin-orbit coupling on the dielectric properties and the electric polarization induced by local polar phase separation domains in RMn2O5 multiferroics has been studied. These parameters is found to be qualitatively distinguished from those studied before in GdMn2O5, in which Gd3+ ion in the ground 8S7/2 state is weakly bounded with