Accession Number : AD0710290

Title :   MAGNETIC IMPURITIES IN NORMAL METALS.

Descriptive Note : Final rept.,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA DEPT OF PHYSICS

Personal Author(s) : Jensen,M. A.

Report Date : JUN 1970

Pagination or Media Count : 9

Abstract : The following three areas were investigated: The study of the many-body nature of a magnetic impurity (Cr, Fe, or Co) in a non-magnetic normal metal (Cu) was carried out by using the host nuclei as a probe of both spatial and temporal conduction electron responses to the impurity. Studies of the temperature, magnetic field, and impurity concentration dependence of the response were carried out. The results of this research established the many-body 'singlet' ground state as the most likely model for the ground state of the magnetic impurity problem. Work was carried out to determine the effect of fluctuations on the superconducting transition temperature and the shape of the transition to infinite conductivity. The major part of this research involved the study of the electric and magnetic field dependence of the superconducting transition in thin films (of aluminum) in which the thermal and depairing fluctuations are most easily observed. The third project was concerned with using the superconducting pairing field in a superconducting thin film to probe the many-body interactions in a normal metal film which is placed juxtaposed to the superconductor and which, therefore, is in the pairing field, within a coherence distance.

Descriptors :   (*COPPER, IMPURITIES), (*SUPERCONDUCTORS, TRANSITION TEMPERATURE), MAGNETIC RESONANCE, GROUND STATE, METAL FILMS, N-BODY PROBLEM, PHONONS

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE