Phys. Rev. B 78, 014523 (2008) [5 pages]

First-order structural phase transition in CaFe₂As₂

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N. Ni, S. Nandi, A. Kreyssig, A. I. Goldman, E. D. Mun, S. L. Bud’ko, and P. C. Canfield
Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 26 June 2008; published 31 July 2008

CaFe₂As₂ has been synthesized and found to form in the tetragonal ThCr₂Si₂ structure with lattice parameters a=3.912(68) Å and c=11.667(45) Å. Upon cooling through 170 K, CaFe₂As₂ undergoes a first-order structural phase transition to a low-temperature orthorhombic phase with a 2–3 K range of hysteresis and coexistence. This transition is clearly evident in microscopic, thermodynamic, and transport measurements. CaFe₂As₂ is the third member of the AFe₂As₂ (A=Ba,Sr,Ca) family to exhibit such a dramatic phase transition and is a promising candidate for studies of doping induced superconductivity.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.78.014523

DOI:

10.1103/PhysRevB.78.014523

PACS:

74.70.Dd, 61.50.Ks, 65.40.Ba, 75.30.Cr

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Phys. Rev. B 78, 014523 (2008) [5 pages]

First-order structural phase transition in CaFe2As2

First-order structural phase transition in CaFe₂As₂