1 - 10 of 21 articles
Torque measurements were performed with cylindrical niobium crystals. Due to the very small pinning of the high-purity material, we were able to study a torque that tries to align the flux lines along special directions of the crystal lattice.
We report observation of the Righi-Leduc effect in the mixed and intermediate states of superconducting alloys of Pb with In, Bi, Sn, and Bi plus Tl and alloys of In with Pb, Cd, and Bi. The tangent of the Righi-Leduc angle, tan θ, as a function of applied fieldH undergoes an abrupt change atH...
Wires of NbN and Nb(C,N) prepared by a diffusion technique were found to exhibit a strong radial gradient in the superconducting transition temperature and in the lattice parameter. The peak effect observed on these samples is discussed with respect to this inhomogeneity of sample structure,...
The flux pinning mechanism in porous type II superconductors is investigated by measurements on sintered Nb samples with relatively small κ values (κ<5). By careful examination of the metallurgical microstructure it is shown that the porous samples can be regarded as metallurgical model...
In order to investigate3He impurity effects on the superfluid transition, measurements were made on the thermodynamic quantities, specific heat, thermal expansion coefficients, and pressure dependence of the λ-transition temperature of three3He-4He mixtures and pure4He in the neighborhood of the...
The adsorption of ideal, binary gaseous and liquid mixtures on heterogeneous solid surfaces is discussed. The theoretical description presented is a generalization for the case of adsorption of mixtures of Cerofolini's treatment for pure gases on real solid surfaces. It appears that the...
It is shown that the behavior of Ce impurities in metallic matrices can be described in a unified way, comprising both the magnetic and the nonmagnetic regimes, as well as the transition region, by means of an Anderson-like Hamiltonian including the degeneracy of the localized states and in the...
The motion of negative ions in liquid helium at temperatures above 0.6 K is governed principally by the scattering of rotons. The mobility is defined as the ratio of the drift velocity,v to the electric fieldE for small electric fields. In stronger electric fields the ratioE/v usually increases...
A modified technique for the sputtering of high-T
Nb3Ge using low Ar pressure is reported. The experimental arrangement involved only conventional equipment and ordinary vacuum conditions. Nb3Si with the A-15 structure was also prepared in a similar manner.
The first monolayer of neon adsorbed on exposed basal planes of graphite has been explored in detail by means of heat capacity measurements on 15 different coverages ranging from 0.06 to 0.91 monolayer for 1.25
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