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Upper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)(2)As-2 (x=0.20 and 0.46)

TitleUpper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)(2)As-2 (x=0.20 and 0.46)
Publication TypeJournal Article
Year of Publication2012
AuthorsHu RW, Mun ED, Altarawneh MM, Mielke CH, Zapf VS, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Volume85
Pages064511
Date Published02
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000300238200008
KeywordsMAGNETIC-FIELDS
Abstract

The upper critical fields H-c2(T) of single crystals of Sr1-xEux(Fe0.89Co0.11)(2)As-2 (x = 0.20 and 0.46) were determined by radio-frequency penetration depth measurements in pulsed magnetic fields. H-c2(T) approaches the Pauli limiting field but shows an upward curvature with an enhancement from the orbital limited field, as inferred from the Werthamer-Helfand-Hohenberg theory. We discuss the temperature dependence of the upper critical fields and the decreasing anisotropy using a two-band BCS model.
URL<Go to ISI>://WOS:000300238200008
DOI10.1103/PhysRevB.85.064511
Alternate JournalPhys. Rev. B