Strong pairbreaking in anisotropic superconductors

TitleStrong pairbreaking in anisotropic superconductors
Publication TypeJournal Article
Year of Publication2010
AuthorsKogan VG
Journal TitlePhysical Review B
Volume81
Pages184528
Date Published05/01
ISBN Number1098-0121
Accession NumberISI:000278141800107
KeywordsCECOIN5, impurities
Abstract

Abrikosov-Gor'kov work on pairbreaking in isotropic materials is generalized to anisotropic Fermi surfaces and order parameters. New scaling relations for states with a strong pairbreaking are found for the specific-heat jump Delta C proportional to T-c(3); for the penetration depth that deviates from the zero-T value as Delta lambda = beta T-2 at low temperatures with beta proportional to T-c(-3), and for the slopes of the upper critical fields H-c2'(T-c)proportional to T-c. A remarkably simple relation between these at first sight unrelated quantities is found: Delta C beta T-2(c)4/vertical bar H-c2'vertical bar=phi(0)/16 pi(2) is a universal constant. The predictions are checked on CeCoIn5 and the possibility to apply them to iron-based materials is discussed.

URL<Go to ISI>://000278141800107
DOI10.1103/Physrevb.81.184528