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Nodal gap in iron-based superconductor CsFe₂As₂ probed by quasiparticle heat transport

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arxiv 1302.2300 v2 pith:GOPZ2A2M submitted 2013-02-10 cond-mat.supr-con cond-mat.str-el

Nodal gap in iron-based superconductor CsFe₂As₂ probed by quasiparticle heat transport

X. C. Hong , X. L. Li , B. Y. Pan , L. P. He , A. F. Wang , X. G. Luo , X. H. Chen , S. Y. Li This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords fieldcsfekappaomegairon-basedmagneticnodalresidual
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The thermal conductivity of iron-based superconductor CsFe$_2$As$_2$ single crystal ($T_c =$ 1.81 K) was measured down to 50 mK. A significant residual linear term $\kappa_0/T$ = 1.27 mW K$^{-2}$ cm$^{-1}$ is observed in zero magnetic field, which is about 1/10 of the normal-state value in upper critical field $H_{c2}$. In low magnetic field, $\kappa_0/T$ increases rapidly with field. The overall field dependence of $\kappa_0/T$ for our CsFe$_2$As$_2$ (with residual resistivity $\rho_0$ = 1.80 $\mu\Omega$ cm) lies between the dirty KFe$_2$As$_2$ (with $\rho_0$ = 3.32 $\mu\Omega$ cm) and the clean KFe$_2$As$_2$ (with $\rho_0$ = 0.21 $\mu\Omega$ cm). These results strongly suggest nodal superconducting gap in CsFe$_2$As$_2$, similar to its sister compound KFe$_2$As$_2$.

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