1 - 9 of 9 articles
A theory of the upper critical field is developed which is sufficiently general to incorporate strong coupling effects, anisotropy of both Fermi surface and pairing interaction, and momentum dependent scattering, including exchange and spin-orbit scattering. It is not necessary to assume that...
The system of the generalized time-dependent Ginzburg-Landau equations (GTDGLE) describing dirty superconductors nearT
is solved numerically for a thin quasi-two-dimensional, current-carrying layer. In a certain current range one has superconducting states with dissipation which should lead...
Spin diffusion in paramagnetic spin systems is a dissipative process which acts so as to remove all spatial variation of the magnetization. In normal and superfluid Fermi liquids its physical origin lies in the nonconservation property of the macroscopic magnetization current associated with the...
We discuss a one-dimensional Falicov-Kimball model away from the symmetry point of the densities by exact methods. We found the well-expected phase separation (segregation) and calculated the interation strength necessary for this effect. This interaction constant (which is already known to be...
In this paper nucleation of superconductivity in films in investigated numerically for all temperatures. Recent predictions of magnetically enhanced superconductivity, even above the critical temperature, are not confirmed. In a limiting case also the surface critical fieldH
c3 was obtained for...
We employ Eliashberg theory to calculate the ratioR=2Δ/k
for s-wave pairing for a two dimensional tight-binding band. The pairing is mediated in our model by exchange of phonons and higher frequency “excitons” which, by themselves, would yield aT
of about 200 K. The additional...
We show that the limit of large dimensions (d=∞) can be used to obtain accurate variational results even for low dimensional (d=1, 2) fermionic systems, such as the Hubbard model or the periodic Anderson model. Using explicit correlated variational wave functions this is achieved by evaluating...
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