Physics and Astronomy, Ames Laboratory
Journal or Book Title
Physical Review B
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.
American Physical Society
Hu, Rongwei; Mun, Eun Deok; Altarawneh, M. M.; Mielke, C. H.; Zapf, V. S.; Bud’ko, Sergey L.; and Canfield, Paul C., "Upper critical fields and two-band superconductivity in Sr1-xEux(Fe0.89Co0.11)(2)As-2 (x=0.20 and 0.46)" (2012). Physics and Astronomy Publications. 642.