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Phys. Rev. B 78, 024516 (2008) [4 pages]

Structural transition and anisotropic properties of single-crystalline SrFe2As2

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J.-Q. Yan1, A. Kreyssig1,2, S. Nandi1,2, N. Ni1,2, S. L. Bud’ko1,2, A. Kracher1, R. J. McQueeney1,2, R. W. McCallum1,3, T. A. Lograsso1, A. I. Goldman1,2, and P. C. Canfield1,2
1Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, USA
2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
3Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA

Received 18 June 2008; published 23 July 2008

Platelike single crystals of SrFe2As2 as large as 3×3×0.5 mm3 have been grown out of Sn flux. The SrFe2As2 single crystals show a structural phase transition from a high-temperature tetragonal phase to a low-temperature orthorhombic phase at To=198 K, and do not show any sign of superconductivity down to 1.8 K. The structural transition is accompanied by an anomaly in the electrical resistivity, Hall resistivity, specific heat, and the anisotropic magnetic susceptibility. In an intermediate temperature range from 198 to 160 K, single-crystal x-ray diffraction suggests a coexistence of the high-temperature tetragonal and the low-temperature orthorhombic phases.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.024516
DOI:
10.1103/PhysRevB.78.024516
PACS:
74.70.Dd, 61.50.Ks, 65.40.Ba, 72.15.−v
 
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