1 - 10 of 13 articles
The transition temperature of the excitonic phaseT
is calculated for various band configurations in the mean field approximation.T
depends on two quantities, the band gap (or the band overlap)2G between unstable Landau subbands andE
, which denotes a configuration of those subbands...
We describe the theory, fabrication, operation, and performance of a cylindrical dc SQUID made with shunted Nb-NbOx-Pb Josephson tunnel junctions. The SQUID is current-biased at a nonzero voltage, and modulated with a 100 kHz flux. The 100 kHz voltage developed across the SQUID is amplified by a...
The imaginary part of the pair-field susceptibility of dirty-limit, superconducting, aluminum films has been obtained both above and below the transition temperature by analyzing the I–V characteristic of asymmetric superconducting tunneling junctions. Results obtained above the transition...
The effect of changes in the lattice parameters on the Fermi surface of zinc is calculated. The results of the calculations are in reasonably good agreement with experimental data.
In order to describe nearly ferromagnetic actinide systems we present here a spin-fluctuation model which considers two narrowd andf bands and which takes into account the two-bodyd–f coupling parameterJ
. The magnetic susceptibility, the γ-coefficient of the linearT term of the electronic...
It is shown that many solvable special cases of the zero-field, one-dimensional Bogoliubov equations in the WKBJ approximation discovered so far are members of a four-parameter family of solvable pair potentials defined by the differential equationdΔ(z)/dz=a+bΔ(z)+cδ
(z), witha, b, andc...
The superfluid density ρ
in the presence of persistent current(v
≠0) is investigated using the Doppler-shifted fourth-sound technique. In the vortex-free Landau state, ρ
remains constant within our experimental resolution of two parts in 10
. This is not inconsistent with a...
A new variational-principle density-functional theory for the spin susceptibility χ has been used to calculate χ for Li, Na, K, Rb, and Cs and its volume dependence for Li and Na. The theory simultaneously includes lattice, core electron, and many-body effects. The exchange-correlation...
It is shown by an ac calorimetry technique that the multiple heat capacity anomalies which occur below the superconducting transition temperature for small polycrystalline Nb3Sn samples are intrinsic to these samples. The recent suggestions that shear stresses can account for these results are...
Heat capacity data are reported which confirm as a bulk effect the previously reported superconductivity in LiTi
. These data also establish LiTi2O4 as a weak couplingd-band superconductor with superconducting state properties well described by the Bardeen—Cooper—Schrieffer theory of...
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