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Angular-dependent upper critical field of overdoped Ba(Fe1-xNix)(2)As-2

TitleAngular-dependent upper critical field of overdoped Ba(Fe1-xNix)(2)As-2
Publication TypeJournal Article
Year of Publication2013
AuthorsMurphy, J, Tanatar, MA, Graf, D, Brooks, JS, Bud'ko, SL, Canfield, PC, Kogan, VG, Prozorov, R
JournalPhysical Review B
Date Published03
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000315729300004
Keywordsanisotropy, critical magnetic-field, high-temperature superconductivity, limit, organic superconductor, parallel, purity dependence, sr2ruo4, superconductors, transition, wave

In-plane resistivity measurements as a function of temperature, magnetic field, and its orientation with respect to the crystallographic ab plane were used to study the upper critical field, H-c2, of two overdoped compositions of the iron-based superconductor Ba(Fe1-xNix)(2)As-2, x = 0.054 and x = 0.072. Measurements were performed using precise alignment (with accuracy less than 0.1 degrees.) of magnetic field with respect to the Fe-As plane. The dependence of the H-c2 on angle theta between the field and the ab plane was measured in isothermal conditions in a broad temperature range. We found that the shape of H-c2(theta) clearly deviates from the Ginzburg-Landau functional form. DOI: 10.1103/PhysRevB.87.094505

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