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Upper critical field of high-quality single crystals of KFe2As2

TitleUpper critical field of high-quality single crystals of KFe2As2
Publication TypeJournal Article
Year of Publication2013
AuthorsLiu, Y, Tanatar, MA, Kogan, VG, Kim, H, Lograsso, TA, Prozorov, R
JournalPhysical Review B
Date Published04
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000317821000002
Keywordshigh-temperature superconductivity

Measurements of temperature-dependent in-plane resistivity rho(T) were used to determine the upper critical field and its anisotropy in high-quality single crystals of the stoichiometric iron arsenide superconductor KFe2As2. The crystals were characterized by the residual resistivity ratio rho(300 K)/rho(0) up to 3000 and the resistive transition midpoint temperature T-c = 3.8 K, significantly higher than in previous studies on the same material. We find increased H-c2(T) for both directions of the magnetic field, which scale with the increased T-c. This unusual linear H-c2(T-c) scaling is not expected for an orbital-limiting mechanism of the upper critical field in clean materials. DOI: 10.1103/PhysRevB.87.134513

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