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

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
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Ames Laboratory
Organizational Unit
Physics and Astronomy
Organizational Unit
Journal Issue
Series
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.

Description
Keywords
Citation
DOI
Collections