Measurement of the upper critical magnetic field of superconductors with magnetic impurities

Journal Article · Fri Dec 01 04:00:00 EST 1978 · Phys. Rev., B: Solid State; (United States)

DOI:https://doi.org/10.1103/PhysRevB.18.6105· OSTI ID:6427766

Lemberger, T R; Ginsberg, D M

We have measured the upper critical magnetic field, H/sub c/2(T), for In-Mn and Pb-Mn films, in which the Mn is a magnetic impurity. The results are compared with the additive-pair-breaking theory of Fulde and Maki, which predicts that the pair-breaking effect of the magnetic impurities is temperature-independent and that the pair-breaking effects of the magnetic impurities and of the applied magnetic field are additive. Furthermore, the theory predicts the explicit temperature dependence of H/sub c/2(T). The results indicate that the temperature dependence of H/sub c/2 is well described by the Fulde-Maki theory for In-Mn, but not for Pb-Mn, probably because of the strong electron-phonon coupling in Pb. For both In-Mn and Pb-Mn, the results indicate that the pair-breaking effect of the magnetic impurities is temperature independent, and that the pair-breaking effects of the magnetic impurities and the applied magnetic field are additive, so the concepts inherent in the Fulde-Maki theory are supported. We find no evidence in the data of the Kondo effect or of impurity spin alignment.

• Research Organization: Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
• OSTI ID: 6427766
• Journal Information: Phys. Rev., B: Solid State; (United States), Journal Name: Phys. Rev., B: Solid State; (United States) Vol. 18:11; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
CRITICAL FIELD
ELEMENTS
FILMS
INDIUM
KONDO EFFECT
LEAD
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MANGANESE ADDITIONS
MANGANESE ALLOYS
METALS
PHYSICAL PROPERTIES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TYPE-II SUPERCONDUCTORS