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

File

2012_CanfieldPaul_UpperCritical.pdf (867.91 KB)

Date

2012-02-01

Authors

Hu, Rongwei
Mun, Eun Deok
Altarawneh, M. M.
Canfield, Paul
Mielke, C. H.
Zapf, V. S.
Bud’ko, Sergey
Canfield, Paul

Altmetrics

Authors

Canfield, Paul

Person

Organizational Units

Ames Laboratory

Organizational Unit

Physics and Astronomy

Organizational Unit

Department

Ames LaboratoryPhysics and Astronomy

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.

Comments

This article is published as Hu, Rongwei, Eun Deok Mun, M. M. Altarawneh, C. H. Mielke, V. S. Zapf, S. L. Bud'ko, and P. C. Canfield. "Upper critical fields and two-band superconductivity in Sr 1− x Eu x (Fe 0.89 Co 0.11) 2 As 2 (x= 0.20 and 0.46)." Physical Review B 85, no. 6 (2012): 064511. DOI: 10.1103/PhysRevB.85.064511. Posted with permission.