First-order structural phase transition in CaFe2As2

被引：283

作者：

Ni, N. ^{[1
]}

Nandi, S.

Kreyssig, A.

Goldman, A. I.

Mun, E. D.

Bud'ko, S. L.

Canfield, P. C.

机构：

[1] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.78.014523

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：5

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