Upper critical field of isoelectron substituted SrFe2(As1-xPx)(2)

TitleUpper critical field of isoelectron substituted SrFe2(As1-xPx)(2)
Publication TypeJournal Article
Year of Publication2013
AuthorsYeninas S, Tanatar MA, Murphy J, Strehlow CP, Ayala-Valenzuela OE, McDonald RD, Welp U, Kwok WK, Kobayashi T, Miyasaka S, Tajima S, Prozorov R
Journal TitlePhysical Review B
Date Published03
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000315728500003
KeywordsDEPTH, high-temperature superconductivity, limit, organic superconductors, parallel, PENETRATION, spin

The upper critical field H-c2 of optimally doped, iron-based superconductor SrFe2(As1-xPx)(2) (x = 0.35, T-c = 25 K) was measured as a function of temperature down to 1.6K for two principal directions of magnetic field H parallel to c and H parallel to a. Measurements were performed in pulsed magnetic fields up to 65 T using a tunnel-diode resonator technique on as-grown and heavy-ion-irradiated single crystals, with columnar defect density corresponding to a matching field B-phi = 25 T. The H-c2,(c) (T) is close to T linear, while clear saturation is observed for H-c2,(a) (T), leading to a strongly temperature-dependent anisotropy parameter gamma. The linear shape of H-c2,(c) (T) is very similar to that observed in nodal KFe2As2, but very different from full-gap LiFeAs. Irradiation does not introduce any additional features on the H-c2(T) line corresponding to the matching field. Instead, it suppresses uniformly both T-c and H-c2, keeping their ratio constant. DOI: 10.1103/PhysRevB.87.094503

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