A. F. Wang, B. Y. Pan, X. G. Luo, F. Chen, Y. J. Yan, J. J. Ying, G. J. Ye, P. Cheng, X. C. Hong, S. Y. Li, X. H. Chen
We measured resistivity and specific heat of high-quality CsFe$_2$As$_2$ single crystals, which were grown by using a self-flux method. The CsFe$_2$As$_2$ crystal shows sharp superconducting transition at 1.8 K with the transition width of 0.1 K. The sharp superconducting transition and pronounced jump in specific heat indicate high quality of the crystals. Analysis on the superconducting-state specific heat supports unconventional pairing symmetry in CsFe$_2$As$_2$.
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http://arxiv.org/abs/1302.5612
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