Low Temperature Physics

A magnetic-field-induced irreversible transition in geometrically frustrated antiferromagnetic TbBaCoO with kagome and triangular lattices

A. N. Bludov, S. L. Gnatchenko, R. Szymczak, H. Szymczak, S. N. Barilo et al.
The temperature dependences M(T) and field dependences M(H) of the magnetization have been measured in single-crystal TbBaCoO for two magnetic-field directions: H||c and H[perpendicular]c. In the case of H||c, a magnetic field-induced irreversible transition is detected at low temperatures, accompan ... [Low Temp. Phys. 35, 971 (2009)] published Thu Dec 31, 2009.

Magnetic and thermal properties of the nanocomposite compound GdNiO

V. M. Dmitriev, E. N. Khatsko, A. V. Terekhov, A. I. Rykova, A. S. Cherny et al.
This paper discusses the temperature and field dependences of the magnetization of the nanocomposite compound GdNiO in the temperature interval 0.5150 K in magnetic fields up to 14 T. The temperature dependences of the heat capacity are also investigated in magnetic fields up to 9 T. Anomalies of ... [Low Temp. Phys. 35, 968 (2009)] published Thu Dec 31, 2009.

Cluster formation in supersonic CO and COKr jets

A. G. Danil'chenko, S. I. Kovalenko, and V. N. Samovarov
The thermodynamic relationship [V. P. Krainov and M. B. Smirnov, Phys. Rep. 370, 237 (2002)] that connects the number of clusters, the mean number of atoms in a cluster, and the gas-condensation temperature in an adiabatically expanding supersonic jet has been experimental verified for the first tim ... [Low Temp. Phys. 35, 965 (2009)] published Thu Dec 31, 2009.

Exciton-stimulated dissociation of D in a xenon matrix

A. G. Belov, M. A. Bludov, and E. I. Tarasova
This paper presents the results of a study of the VUV and UV cathodoluminescence spectra of Xe-D solid mixtures as a function of the D concentration and the irradiation dose at T=4.2 K. It is shown that a number of radiation-stimulated processes [dissociation of D, diffusion of fragments, formation ... [Low Temp. Phys. 35, 957 (2009)] published Thu Dec 31, 2009.

Polaronic effects in electron shuttling

Gleb A. Skorobagatko, Ilya V. Krive, and Robert I. Shekhter
A shuttle-like mechanism of electron transport through a single level vibrating quantum dot is considered in the regime of strong electromechanical coupling. It is shown that the increment of shuttle instability is a nonmonotonic function of the driving voltage. The interplay of two oppositively act ... [Low Temp. Phys. 35, 949 (2009)] published Thu Dec 31, 2009.

Observation of exciton luminescence from icosahedral xenon-argon clusters

V. L. Vakula, O. G. Danylchenko, Yu. S. Doronin, S. I. Kovalenko, M. Yu. Libin et al.
Exciton-impurity luminescence is observed for the first time in binary mixtures of solidified rare gases, in the xenon-argon system with argon as the impurity. An intense exciton-impurity emission band is observed in binary clusters having the structure of a multilayered icosahedron. The optical tra ... [Low Temp. Phys. 35, 944 (2009)] published Thu Dec 31, 2009.

The effect of sorbed hydrogen on low-temperature radial thermal expansion of single-walled carbon nanotube bundles

A. V. Dolbin, V. B. Esel'son, V. G. Gavrilko, V. G. Manzhelii, S. N. Popov et al.
The effect of a normal H impurity upon the radial thermal expansion alpha of single-walled carbon nanotube (SWNT) bundles is investigated in the interval T=2.227 K using the dilatometric method. It is found that H saturation of SWNT bundles causes a shift of the temperature interval of the negative ... [Low Temp. Phys. 35, 939 (2009)] published Thu Dec 31, 2009.

An alternative view at the zero-bias anomaly of metallic point contacts

Kurt Gloos
We have studied the zero-bias anomaly of point contacts as function of contact size for a wide range of materials from simple normal metals, superconductors, and magnets to highly correlated heavy-fermion compounds. The size deltaR of the zero-bias anomaly varied in a universal manner proportional t ... [Low Temp. Phys. 35, 935 (2009)] published Thu Dec 31, 2009.

Antiferromagnetic resonance in MnPS

M. I. Kobets, K. G. Dergachev, S. L. Gnatchenko, E. N. Khats'ko, Yu. M. Vysochanskii et al.
The antiferromagnetic resonance (AFMR) spectra along the principal magnetic axes x, y, z of the compound MnPS have been investigated in detail in a wide range of frequencies (8142 GHz) and magnetic fields (up to 75 kOe) at T=4.2 K. It is shown that this compound is a biaxial magnetic substance. A ... [Low Temp. Phys. 35, 930 (2009)] published Thu Dec 31, 2009.

Dynamics of trapped magnetic fluxes in single-crystal YBCO in weak fields

V. P. Timofeev, A. A. Shablo, and V. Yu. Monarkha
The dynamics of low-density trapped magnetic fluxes, including local fluxes, are investigated in single-crystal YBCO in the region of strong thermal fluctuations near the superconducting phase transition. A substantial difference of the isothermal magnetization-relaxation behavior from the quasi-log ... [Low Temp. Phys. 35, 926 (2009)] published Thu Dec 31, 2009.

Frequency dependence of the electromagnetic-field-induced resistance of a phase-slip line

V. M. Dmitriev and I. V. Zolochevskii
The resistance of a high-frequency phase-slip line (an ac PSL) in a wide tin film has been experimentally investigated as a function of the external irradiation frequency. It is shown that the behavior of the descending branch of the nonmonotonic frequency dependence of the ac PSL resistance agrees ... [Low Temp. Phys. 35, 922 (2009)] published Thu Dec 31, 2009.

Hysteresis of the bcchcp transition in a solid mixture of He in He

A. P. Birchenko, E. O. Vekhov, N. P. Mikhin, and K. A. Chishko
Hysteresis of the bcchcp transition is observed by precision barometry in samples of a solid mixture of 1% He in He grown by the capillary blocking method. It is shown that the lines of equilibrium bcchcp and hcpbcc transitions on the PT diagram on cooling and heating do not coincide (the cooling li ... [Low Temp. Phys. 35, 914 (2009)] published Thu Dec 31, 2009.

Mutual friction in helium II: a microscopic approach

H. M. Cataldo
We develop a microscopic model of mutual friction represented by the dissipative dynamics of a normal fluid flow which interacts with the helical normal modes of vortices comprising a lattice in thermal equilibrium. Such vortices are assumed to interact with the quasiparticles forming the normal flu ... [Low Temp. Phys. 35, 909 (2009)] published Thu Dec 31, 2009.

Cryomechanically obtained nanocrystalline titanium: microstructure and mechanical properties

V. A. Moskalenko, A. R. Smirnov, and A. V. Moskalenko
Using a cryomechanical treatment method (an alternative method of intense plastic deformation), nanocrystalline bulk titanium of technical-grade purity with average grain-size up to 35 nm has been obtained for the first time. The method is based on the authors' previous investigations of the role o ... [Low Temp. Phys. 35, 905 (2009)] published Mon Dec 14, 2009.

Strain-rate sensitivity of the flow stress of ultrafine-grain aluminum at temperatures 4.2295 K

N. V. Isaev, T. V. Grigorova, and P. A. Zabrodin
The influence of the grain size on the dislocation interaction mechanisms that control the deformation of aluminum in the temperature range 4.2295 K is studied. For this, samples of coarse-grain (CG) and ultrafine-grain (UFG) aluminum obtained by equi-channel angular pressing were deformed by stret ... [Low Temp. Phys. 35, 898 (2009)] published Mon Dec 14, 2009.

Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases

A. I. Krivchikov, I. V. Sharapova, O. A. Korolyuk, O. O. Romantsova, and F. J. Bermejo
The thermal conductivity kappa(T) of crystalline alcohols (methyl, ethyl and 1-propyl) within their thermodynamic equilibrium phases for T>=2 K and under the equilibrium vapor pressures has been measured and analyzed. While such compounds usually exhibit a rich polymorphism including amorphous and ... [Low Temp. Phys. 35, 891 (2009)] published Mon Dec 14, 2009.

Resistivity of bulk amorphous ZrBeTiCuNi and its polycrystalline analogue

A. A. Vasil'ev, K. V. Kovtun, S. V. Malykhin, B. A. Merisov, A. T. Pugachev et al.
The resistivity of the bulk amorphous alloy ZrBeTiCuNi and a polycrystal with the same composition has been measured in the temperature interval 1.5300 K. The Faber-Ziman model (bulk amorphous alloy) and the Bloch-Gruneisen model (polycrystal) are used as a basis to make a fit to the temperature de ... [Low Temp. Phys. 35, 887 (2009)] published Mon Dec 14, 2009.

Electronic structure of a (12, 0) carbon nanotube encapsulated with crystalline potassium

V. G. But'ko, A. A. Gusev, T. N. Shevtsova, and Yu. G. Pashkevich
The methods of density functional theory are used to perform calculations of the band structure of a zigzag (12, 0) carbon nanotube, both ideal and filled with one-dimensional tetragonal crystalline potassium. The calculations take account of optimization of the structural parameters. It is shown th ... [Low Temp. Phys. 35, 883 (2009)] published Mon Dec 14, 2009.

Electric properties of erbium cobaltites

Yu. N. Chiang, M. O. Dzyuba, V. F. Khirnyi, O. G. Shevchenko, and A. A. Kozlovskii
The temperature and electric, including magnetic-field, characteristics of ceramic samples ErSrCoO at temperatures ranging from room to liquid-helium temperatures and in magnetic fields to 4 kOe applied perpendicular to the direction of the transport current have been investigated. Current-induced ... [Low Temp. Phys. 35, 876 (2009)] published Mon Dec 14, 2009.

Magnetic anisotropy of Co/Cu (111) superlattices: calculation and experiment

K. V. Kut'ko, A. I. Kaplienko, E. P. Nikolova, A. G. Anders, V. V. Zorchenko et al.
The results of theoretical calculations and experimental data for the effective magnetic anisotropy K (obtained from ferromagnetic resonance measurements) of [Co(8 A)/Cu(d)] (d=722 A) superlattices with a coherent interaction of the Co and Cu layers prepared by magnetron sputtering are presented. ... [Low Temp. Phys. 35, 869 (2009)] published Mon Dec 14, 2009.

Anisotropy of the magnetic properties and the electronic structure of transition-metal diborides

A. V. Fedorchenko, G. E. Grechnev, A. S. Panfilov, A. V. Logosha, I. V. Svechkarev et al.
The temperature dependences of the magnetic susceptibility chi and its anisotropy Deltachi=chichi have been measured for hexagonal single crystals of transition-metal diborides MB (M=Sc,Ti,V,Zr,Hf) in the temperature interval 4.2300 K. It is found that the anisotropy Deltachi is weakly temperature- ... [Low Temp. Phys. 35, 862 (2009)] published Mon Dec 14, 2009.