2008/06/26 by Ni Ni, N. Ni, S. Nandi +7 · 2 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.014523
published as Phys. Rev. B 78, 014523 (2008)
arxiv created 2008/06/26 · openalex publication_date 2008/07/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
CaFe2As2 has been synthesized and found to form in the tetragonal ThCr2Si2 structure with lattice parameters a=3.912(68) \text\AA and c=11.667(45) \text\AA. 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.