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Enhancement of the upper critical field in codoped iron-arsenic high-temperature superconductors

By F. Weickert, M. Nicklas, W. Schnelle, J. Wosnitza, A. Leithe-Jasper and H. Rosner

Abstract

We present the first study of codoped iron-arsenide superconductors of the 122 family (Sr/Ba)_(1-x)K_xFe_(2-y)Co_yAs_2 with the purpose to increase the upper critical field H_c2 compared to single doped (Sr/Ba)Fe_2As_2 materials. H_c2 was investigated by measuring the magnetoresistance in high pulsed magnetic fields up to 64 T. We find, that H_c2 extrapolated to T = 0 is indeed enhanced significantly to ~ 90 T for polycrystalline samples of Ba_0.55K_0.45Fe_1.95Co_0.05As_2 compared to ~75 T for Ba_0.55K_0.45Fe_2As_2 and BaFe_1.8Co_0.2As_2 single crystals. Codoping thus is a promising way for the systematic optimization of iron-arsenic based superconductors for magnetic-field and high-current applications.Comment: 7 pages, 5 figures, submitted to Journal of Applied Physic

Topics: Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons
Publisher: 'AIP Publishing'
Year: 2011
DOI identifier: 10.1063/1.3665700
OAI identifier: oai:arXiv.org:1110.0478

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