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Phys. Rev. B 80, 024508 (2009) [6 pages]

Superconducting state coexisting with a phase-separated static magnetic order in (Ba,K)Fe2As2, (Sr,Na)Fe2As2, and CaFe2As2

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T. Goko1,2,3, A. A. Aczel3, E. Baggio-Saitovitch4, S. L. Bud’ko5, P. C. Canfield5, J. P. Carlo2, G. F. Chen6, Pengcheng Dai7, A. C. Hamann8, W. Z. Hu6, H. Kageyama9, G. M. Luke3, J. L. Luo6, B. Nachumi2, N. Ni5, D. Reznik8, D. R. Sanchez-Candela4, A. T. Savici10, K. J. Sikes2, N. L. Wang6, C. R. Wiebe11, T. J. Williams3, T. Yamamoto9, W. Yu3, and Y. J. Uemura2,*
1TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
2Department of Physics, Columbia University, New York, New York 10027, USA
3Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
4Centro Brasileiro de Pesquisas Fisicas, Rua Xavier Sigaud 150 Urca, CEP 22290-180 Rio de Janeiro, RJ, Brazil
5Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
6Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
7Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
8Forschungszentrum Karlsruhe, Institut für Festkörperphysik, Postfach 3640, D-76021 Karlsruhe, Germany
9Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan
10Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
11Department of Physics, Florida State University, Tallahassee, Florida 32310, USA

Received 20 August 2008; revised 10 June 2009; published 14 July 2009

By muon spin-relaxation measurements on single-crystal specimens, we show that superconductivity in the AFe2As2 (A=Ca,Ba,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 (Ba0.5K0.5)Fe2As2 exhibits a nearly linear variation in T at low temperatures, suggesting an anisotropic energy gap with line nodes and/or multigap effects.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.024508
DOI:
10.1103/PhysRevB.80.024508
PACS:
74.25.Dw, 74.25.Nf, 75.25.+z, 76.75.+i

*Author to whom correspondence should be addressed; tomo@lorentz.phys.columbia.edu

 
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