Physics – Condensed Matter – Superconductivity
Scientific paper
2010-04-25
2011 J. Phys.: Condens. Matter 23 255701
Physics
Condensed Matter
Superconductivity
6 pages,5 figures Accepted by J. Phys.: Condens. Matter
Scientific paper
10.1088/0953-8984/23/25/255701
In this paper we present detailed M\"ossbauer spectroscopy study of structural and magnetic properties of the undoped parent compound CaFe$_2$As$_2$ single crystal. By fitting the temperature dependence of the hyperfine magnetic field we show that the magneto-structural phase transition is clearly first-order in nature and we also deduced the compressibility of our sample to be $1.67\times10^{-2}\,GPa^{-1}$. Within the Landau's theory of phase transition, we further argue that the observed phase transition may stem from the strong magneto-structural coupling effect. Temperature dependence of the Lamb-M\"ossbauer factor show that the paramagnetic phase and the antiferromagnetic phase exhibit similar lattice dynamics in high frequency modes with very close Debye temperatures, $\Theta_D \sim$270\,K.
Li Fashen
Li Zhiwei
Ma Xiaoming
Pang Hua
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