Accession Number : AD0646909

Title :   ON THE BULK (H SUB C2) AND SURFACE (H SUB C3) NUCLEATION FIELDS OF STRONG COUPLING SUPERCONDUCTING ALLOYS.

Descriptive Note : Technical rept.,

Corporate Author : CORNELL UNIV ITHACA N Y LAB OF ATOMIC AND SOLID STATE PHYSICS

Personal Author(s) : Eilenberger,Gert H. U. ; Ambegaokar,Vinay

Report Date : JAN 1967

Pagination or Media Count : 33

Abstract : The linearized self consistency equation, in the electron phonon model, for the nucleation of superconductivity in the presence of a magnetic field was studied. It was found that near the transition temperature this integrodifferential equation is susceptible to analysis. The main results were that the ratio of surface to bulk nucleation fields was predicted to have the weak coupling value of 1.695, thus not confirming a recent experimental suggestion of a value near 1.9 for strong coupling superconductors. The slope (differential H sub c3/differential T) sub T sub c was worked out both in terms of integrals over the parameters of the bulk strong coupling theory and in terms of other experimental quantities. Comparison of this last result with existing experiments on pure lead was attempted, with good success. An implicit equation for H sub c2(T) for all T was derived, but the numerical work necessary to solve this equation was not undertaken. (Author)

Descriptors :   (*SUPERCONDUCTORS, *NUCLEATION), (*MAGNETIC FIELDS, SUPERCONDUCTORS), DIFFERENTIAL EQUATIONS, ALLOYS, FIELD THEORY

Subject Categories : Physical Chemistry
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE