First-order structural phase transition in CaFe2As2

TitleFirst-order structural phase transition in CaFe2As2
Publication TypeJournal Article
Year of Publication2008
AuthorsNi N, Nandi S, Kreyssig A, Goldman AI, Mun ED, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Volume78
Pages014523
Date PublishedJul
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000258190000118
Keywords43 k, lao1-xfxfeas, superconductivity
Abstract

CaFe2As2 has been synthesized and found to form in the tetragonal ThCr2Si2 structure with lattice parameters a=3.912(68) angstrom and c=11.667(45) angstrom. 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 AFe(2)As(2) (A=Ba,Sr,Ca) family to exhibit such a dramatic phase transition and is a promising candidate for studies of doping induced superconductivity.

DOI10.1103/PhysRevB.78.014523
Alternate JournalPhys. Rev. B