Critical temperature of strong coupling superconductors with paramagnetic impurities

Journal Article · Fri Mar 01 04:00:00 EST 1985 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681137· OSTI ID:5546026

Ashraf, M; Carbotte, J P

We calculate the effects of paramagnetic impurities on the critical temperature of several intermediate and strong coupling superconductors by numerically solving the Eliashberg equations, and compare the results with the results of Abrikosov-Gorkov theory. For all the superconductors considered, the values of critical impurity concentration obtained from this exact numerical calculation are found to be considerably larger than the values given by Abrikosov-Gorkov theory. By generalizing a previous work of Leavens and Carbotte, we derive simple analytical expressions for the critical temperature and the critical concentration that give results much closer to the exact values than the corresponding BCS values.

• Research Organization: Physics Department, McMaster University, Hamilton, Ontario, Canada
• OSTI ID: 5546026
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 58:5; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

656101* -- Solid State Physics-- Superconductivity-- General Theory-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABRIKOSOV THEORY
BCS THEORY
GORKOV-ELIASHBERG THEORY
IMPURITIES
MAGNETISM
MATHEMATICAL MODELS
NUMERICAL SOLUTION
PARAMAGNETISM
PARTICLE MODELS
PHYSICAL PROPERTIES
QUANTITY RATIO
STRONG-COUPLING MODEL
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE