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

N. Ni; S. Nandi; A. Kreyssig; A. I. Goldman; E. D. Mun; S. L. Bud'ko; P. C. Canfield

doi:10.1103/PhysRevB.78.014523

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

Strongly Correlated Electrons 2009-11-13 v1

Authors: N. Ni , S. Nandi , A. Kreyssig , A. I. Goldman , E. D. Mun , S. L. Bud'ko , P. C. Canfield

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Abstract

CaFe $_2$ As $_2$ has been synthesized and found to form in the tetragonal, ThCr $_2$ Si $_2$ structure with lattice parameters $a = 3.912(68) \AA$ and $c = 11.667(45) \AA$ . 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.

Keywords

single crystal superconductivity phase transitions high-temperature superconductivity

Cite

@article{arxiv.0806.4328,
  title  = {First order structural phase transition in CaFe$_2$As$_2$},
  author = {N. Ni and S. Nandi and A. Kreyssig and A. I. Goldman and E. D. Mun and S. L. Bud'ko and P. C. Canfield},
  journal= {arXiv preprint arXiv:0806.4328},
  year   = {2009}
}

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

Abstract

Keywords

Cite

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