Low Temperature Physics

Evidence for low-temperature antiferromagnetic phase transition in Ising singlet magnet KTb(WO)

E. Khatsko, C. Paulsen, and A. Rykova
The magnetic susceptibility and magnetization measured along the b axis of a KTb(WO) single crystal was investigated experimentally in the temperature range 70 mK6 K and in magnetic fields up to 8 T. The results allow us to make conclusion that singlet magnet KTb(WO) undergoes an antiferromagnetic p ... [Low Temp. Phys. 37, 1048 (2012)] published Wed Jan 25, 2012.

The polarization properties of an atomic gas in a coherent state

Yu. M. Poluektov
A possibility of polarization of the gas of hydrogen-like atoms at zero temperature in the BoseEinstein condensate is studied at equilibrium and nonequilibrium conditions. The GrossPitaevskii equation is generalized for a gas of atoms considering their electronic structure. It is shown that the wave ... [Low Temp. Phys. 37, 986 (2012)] published Wed Jan 25, 2012.

Magnetic phase transitions in the NdFe(BO) multiferroic

G. A. Zvyagina, K. R. Zhekov, I. V. Bilych, A. A. Zvyagin, I. A. Gudim et al.
Low-temperature studies of the behavior of the sound velocity and attenuation of acoustic modes have been performed on a single crystal NdFe(BO) Transitions of the magnetic subsystem to the antiferromagnetically ordered state at T [approximate] 30.6 K have been revealed in the temperature behavior o ... [Low Temp. Phys. 37, 1010 (2012)] published Wed Jan 25, 2012.

Critical properties of an antiferromagnetic Ising model on a square lattice with interactions of the next-to-nearest neighbors

A. K. Murtazaev, M. K. Ramazanov, and M. K. Badiev
The critical properties of an antiferromagnetic Ising model on a square lattice with interactions of the next-to-nearest neighbors are investigated by a replica Monte-Carlo method. Using the finite-size scaling theory the static critical exponents of specific heat, ordering parameter, susceptibility ... [Low Temp. Phys. 37, 1001 (2012)] published Wed Jan 25, 2012.

Free and bound states of excitons in a percolation cluster of ZnSe quantum dots in a dielectric matrix

N. V. Bondar and M. S. Brodyn
Two-phase systems (borosilicate glass with ZnSe quantum dots) were studied. The results obtained provided an insight both into the mechanism of formation of a phase percolation transition of excitons in the array of quantum dots at the critical concentration and radii and the contribution of dielect ... [Low Temp. Phys. 37, 1026 (2012)] published Wed Jan 25, 2012.

Investigation of titanium nanostructure deformed at low temperatures

I. S. Braude, N. N. Gal'tsov, V. A. Moskalenko, and A. R. Smirnov
The bulk titanium with a grain size from nanometer to submicron was obtained using cryomechanical treatment. An investigation of nanostructure, determining unusual mechanical properties of the new material, was performed by methods of transmission electron microscopy and X-ray diffraction. The resul ... [Low Temp. Phys. 37, 1042 (2012)] published Wed Jan 25, 2012.

Molecular rotation in p-H and o-D in phase I under pressure

Yu. A. Freiman, S. M. Tretyak, Alexander F. Goncharov, Ho-kwang Mao, and Russell J. Hemley
The orientational order parameter, rotational ground-state energy, and lattice distortion parameter (the deviation of the c/a ratio from the ideal hcp value 1.633) in hcp lattice of phase I of p-H and o-D are calculated using a semi-empirical approach. It is shown that the lattice distortion in thes ... [Low Temp. Phys. 37, 1038 (2012)] published Wed Jan 25, 2012.

Resistive current state of a wide superconducting film

I. V. Zolochevskii
The current-voltage characteristics (CVCs) of vortex superconducting films are investigated in a wide temperature range. It is shown for the first time that the experimental CVCs and their parameters are described well enough by asymptotic formulas within the theory of the vortex resistive state of ... [Low Temp. Phys. 37, 979 (2012)] published Wed Jan 25, 2012.

Monte Carlo simulation of anisotropic ShastrySutherland lattice in the framework of classical Heisenberg model multiferroic

V. V. Slavin and A. A. Krivchikov
Monte Carlo simulation of two-dimensional ShastrySutherland lattice has been carried out using heat-bath method. The dependencies of magnetization M on external field H have been obtained in the framework of classical Heisenberg model. In certain interval of exchange parameters ratio the plateau of ... [Low Temp. Phys. 37, 1006 (2012)] published Wed Jan 25, 2012.

Structural and electronic properties of single-wall carbon nanotubes with various nitrogen content

V. G. Boutko, A. A. Gusev, T. N. Shevtsova, and Yu. G. Pashkevich
The band structure of a carbon-nitrogen nanotube of zigzag type (8, 0) with nitrogen atom concentrations of 6.25%, 12.5%, and 25% and armchair (5, 5) carbon-nitrogen nanotube with nitrogen atom concentrations of 10% and 20% is calculated within the density functional theory approach. The calculation ... [Low Temp. Phys. 37, 1021 (2012)] published Wed Jan 25, 2012.

Low-temperature magnetic and thermal properties of the frustrated two-dimensional S = 1 compound Ni(TeO)Cl

E. Khatsko, S. V. Nizhankovskii, S. Gnatchenko, A. Zaleski, P. Lemmens et al.
The temperature and magnetic field dependent magnetization of the two-dimensional quantum spin system Ni(TeO)Cl has been investigated using single crystals in temperature range 1.8100 K and in magnetic fields up to 14 T. The magnetization below the magnetic phase transition demonstrates an unusual t ... [Low Temp. Phys. 37, 1050 (2012)] published Wed Jan 25, 2012.

Magnetopolaronic effects in electron transport through a single-level vibrating quantum dot

G. A. Skorobagatko, S. I. Kulinich, I. V. Krive, R. I. Shekhter, and M. Jonson
Magnetopolaronic effects are considered in electron transport through a single-level vibrating quantum dot subjected to a transverse (to the current flow) magnetic field. It is shown that the effects are most pronounced in the regime of sequential electron tunneling, where a polaronic blockade of th ... [Low Temp. Phys. 37, 1032 (2012)] published Wed Jan 25, 2012.

The Landau band effects in the quantum magnetic oscillations and the deviations from the quasiclassical LifshitzKosevich theory in quasi-two-dimensional conductors

V. M. Gvozdikov
The quantum magnetic oscillations (QMO) in the layered and quasi-two-dimensional (2D) conductors deviate from the quasiclassical LifshitzKosevich (LK) theory developed for 3D conventional metals. We discuss deviations related to the broadening of the Landau levels into Landau bands by various mechan ... [Low Temp. Phys. 37, 964 (2012)] published Tue Jan 10, 2012.

Metafluid with anisotropic dynamic mass

L. N. Gumen, J. Arriaga, and A. A. Krokhin
We show that a fluid filling the space between metallic cylinders arranged in a two-dimensional lattice exhibits anisotropic dynamic mass for sound waves propagating through the lattice, if its unit cell is anisotropic. Using the plane-waves expansion method we derive (in the long wavelength limit) ... [Low Temp. Phys. 37, 975 (2012)] published Tue Jan 10, 2012.

Anderson localization in metamaterials with compositional disorder

E. J. Torres-Herrera, F. M. Izrailev, and N. M. Makarov
We consider one-dimensional periodic-on-average bi-layered models with random perturbations in dielectric constants of both basic slabs composing the structure unit-cell. We show that when the thicknesses d and d of basic layers are essentially nonequal, d [not-equal] d, the localization length L is ... [Low Temp. Phys. 37, 957 (2012)] published Tue Jan 10, 2012.

Microwave-induced spin-flip scattering of electrons in point contacts

A. M. Kadigrobov, R. I. Shekhter, I. Aronov, S. I. Kulinich, A. Pulkin et al.
We investigate resonant interaction of conduction electrons with an electromagnetic field that irradiates a point contact between a ferromagnetic and a normal metal in the presence of a strong magnetic field of order 1 T. We show that electron spin-flips caused by resonant absorption and stimulated ... [Low Temp. Phys. 37, 925 (2012)] published Tue Jan 10, 2012.

Rainbow trapping of guided waves

Javier Polanco, Rosa M. Fitzgerald, Tamara A. Leskova, and Alexei A. Maradudin
We study theoretically the propagation of a wave packet that is a superposition of three s-polarized guided waves with different frequencies in a planar waveguide consisting of a dielectric medium with a graded index of refraction, sandwiched between perfectly conducting walls. The electric field at ... [Low Temp. Phys. 37, 933 (2012)] published Tue Jan 10, 2012.

Flux-cutting and flux-transport effects in type-II superconductor slabs in a parallel rotating magnetic field

R. Cortes-Maldonado, J. E. Espinosa-Rosales, A. F. Carballo-Sanchez, and F. Perez-Rodriguez
The magnetic response of irreversible type-II superconductor slabs subjected to in-plane rotating magnetic field is investigated by applying the circular, elliptic, extended-elliptic, and rectangular flux-line-cutting critical-state models. Specifically, the models have been applied to explain exper ... [Low Temp. Phys. 37, 947 (2012)] published Tue Jan 10, 2012.

Strong nonlinear effects in conductivity of thin metallic samples (Review Article)

I. F. Voloshin, N. M. Makarov, L. M. Fisher, and V. A. Yampol'skii
A series of works, dealt with nontrivial nonlinear stationary and nonstationary phenomena accompanying the flow of the transport current through thin pure single-crystal samples of metals at low temperatures, are discussed. The mechanism of the nonlinearity is magnetidynamical and related with an ef ... [Low Temp. Phys. 37, 895 (2012)] published Tue Jan 10, 2012.

Nonlinear effects in propagation of radio waves in metals (Review Article)

V. G. Skobov and A. S. Chernov
The main results of works on study of influence of nonlinearity on propagation of radio waves through metals placed in a constant magnetic field are described. The trapping of carriers by the magnetic field of a wave with a large amplitude leads to suppression of collisionless absorption and to a po ... [Low Temp. Phys. 37, 903 (2012)] published Tue Jan 10, 2012.

Collective excitations of electron gas on the nanotube surface in a magnetic field

A. M. Ermolaev, G. I. Rashba, and M. A. Solyanik
The spectra of magnetoplasma waves, zero sound and spin waves in an electron gas on a surface of a nonferromagnetic nanotube in longitudinal magnetic field are considered. The initial spectrum of the electron energy is assumed to be parabolic, and the interelectron interaction is taken into account ... [Low Temp. Phys. 37, 919 (2012)] published Tue Jan 10, 2012.