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Phys. Rev. B 78, 214503 (2008) [5 pages]

Muon-spin-relaxation studies of magnetic order and superfluid density in antiferromagnetic NdFeAsO, BaFe2As2, and superconducting Ba1−xKxFe2As2

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A. A. Aczel1, E. Baggio-Saitovitch2, S. L. Budko3, P. C. Canfield3, J. P. Carlo4, G. F. Chen5, Pengcheng Dai6, T. Goko4,1,7, W. Z. Hu5, G. M. Luke1, J. L. Luo5, N. Ni3, D. R. Sanchez-Candela2, F. F. Tafti8, N. L. Wang5, T. J. Williams1, W. Yu1, and Y. J. Uemura4,*
1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
2Centro Brasilieiro de Pesquisas Fisicas, Rua Xavier Sigaud 150 Urca, CEP 22290-180 Rio de Janeiro, Brazil
3Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
4Department of Physics, Columbia University, New York, New York 10027, USA
5Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
6Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
7TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
8Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7

Received 25 October 2008; published 2 December 2008

Zero-field (ZF) muon-spin-relaxation (μSR) measurements have revealed static commensurate magnetic order of Fe moments in NdFeAsO below TN∼135 K, with the ordered moment size nearly equal to that in LaFeAsO, and confirmed similar behavior in BaFe2As2. In single crystals of superconducting Ba0.55K0.45Fe2As2, μSR spectra indicate static magnetism with incommensurate or short-ranged spin structure in ∼70% of volume below TN∼80 K, coexisting with the remaining volume which exhibits a superfluid response below Tc∼30 K.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.214503
DOI:
10.1103/PhysRevB.78.214503
PACS:
74.90.+n, 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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