First order structural phase transition in CaFe${}_2$As${}_2$

Abstract

CaFe${}_2$As${}_2$ has been synthesized and found to form in the tetragonal, ThCr${}_2$Si${}_2$ structure with lattice parameters $a=3.912(68)\mathring{A}$ and $c=11.667(45)\mathring{A}$. Upon cooling through 170 K, CaFe${}_2$As${}_2$ 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. CaFe${}_2$As${}_2$ 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.

References in corpus (6)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Structural transition and anisotropic properties of single crystalline SrFe2As2
• Synthesis and Properties of CaFe${}_2$As${}_2$ Single Crystals

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