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Anisotropic criteria for the type of superconductivity

TitleAnisotropic criteria for the type of superconductivity
Publication TypeJournal Article
Year of Publication2014
AuthorsKogan, VG, Prozorov, R
JournalPhysical Review B
Date Published08
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000341262500005
Keywordscritical-field, dependence, equations, intercalation compounds, stability, temperature

The classical criterion for classification of superconductors as type I or type II based on the isotropic Ginzburg-Landau theory is generalized to arbitrary temperatures for materials with anisotropic Fermi surfaces and order parameters. We argue that the relevant quantity for this classification is the ratio of the upper and thermodynamic critical fields H-c2/H-c, rather than the traditional ratio of the penetration depth and the coherence length lambda/xi. Even in the isotropic case, H-c2/H-c coincides with root 2 lambda/xi only at the critical temperature T-c and they differ as T decreases, the long-known fact. Anisotropies of Fermi surfaces and order parameters may amplify this difference and render false the criterion based on the value of kappa = lambda/xi.

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