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American Physical Society, Physical review B, 2(80)

DOI: 10.1103/physrevb.80.024508

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Superconducting state coexisting with a phase-separated static magnetic order in(Ba,K)Fe2As2,(Sr,Na)Fe2As2, andCaFe2As2

Journal article published in 2009 by T. Goko, A. A. Aczel, E. Baggio-Saitovitch, S. L. Bud’ko, P. C. Canfield, J. P. Carlo, G. F. Chen, Pengcheng Dai, A. C. Hamann, W. Z. Hu, H. Kageyama, G. M. Luke ORCID, J. L. Luo, B. Nachumi, N. Ni and other authors.
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This paper is available in a repository.

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Abstract

By muon spin-relaxation measurements on single-crystal specimens, we show that superconductivity in the $A{\text{Fe}}_{2}{\text{As}}_{2}$ $(A=\text{Ca},\text{Ba},\text{Sr})$ systems, in both the cases of composition and pressure tunings, coexists with a strong static magnetic order in a partial volume fraction. The superfluid response from the remaining paramagnetic volume fraction of $({\text{Ba}}_{0.5}{\text{K}}_{0.5}){\text{Fe}}_{2}{\text{As}}_{2}$ exhibits a nearly linear variation in $T$ at low temperatures, suggesting an anisotropic energy gap with line nodes and/or multigap effects.