Accession Number : AD0660663

Title :   SPATIAL VARIATIONS OF THE ORDER PARAMETERS IN SUPERCONDUCTORS CONTAINING MAGNETIC IMPURITIES.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS

Personal Author(s) : Heinrichs,Jean

Report Date : 18 OCT 1967

Pagination or Media Count : 40

Abstract : The problem of spatial variations of the order parameter in the vicinity of a paramagnetic impurity and near the transition temperature is reconsidered by means of a more rigorous formalism than in a discussion which appeared recently in the literature. General expressions are derived for the spatially inhomogeneous part of the order parameter and its effect on the critical temperature in the limit of very small concentrations of impurities. A detailed analysis shows that the dominant variations of the order parameter range to a distance of the order of the coherence length from a single impurity, but that this parameter also exhibits weak long-range variations. Both smooth spatial variations and fast oscillations show up in the expression of the superconducting order parameter. In the Born approximation the result for the transition temperature coincides with that of the Abrikosov-Gor'kov theory where the average value of the order parameter is used. The next order correction, due to spatial variations, leads to a small increase of the transition temperature, which is explicitly estimated.

Descriptors :   (*SUPERCONDUCTORS, IMPURITIES), (*TRANSITION TEMPERATURE, SUPERCONDUCTORS), PARAMAGNETIC MATERIALS, OSCILLATION, INTERACTIONS, MATHEMATICAL ANALYSIS, TRANSPORT PROPERTIES

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE