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Superconductivity and structural distortion in BaPt$_2$As$_2$

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arxiv 1409.7859 v2 pith:56UBD4IO submitted 2014-09-28 cond-mat.supr-con

W. B. Jiang , C. Y. Guo , Z. F. Weng , Y. F. Wang , Y. H. Chen , Y. Chen , G. M. Pang , T. Shang
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X. Lu H. Q. Yuan
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classification cond-mat.supr-con
keywords baptstructuralsuperconductivityassociatedbcs-typecabecharge-density-wavecompound
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abstract

We successfully synthesized the BaPt$_2$As$_2$ single crystals and studied their structural and physical properties at low temperatures. BaPt$_2$As$_2$ crystallizes in the CaBe$_2$Ge$_2$-type tetragonal structure (P4/nmm) at room temperature and undergoes a first-order structural transition at $T_S\simeq 275$ K, which is likely associated with a charge-density-wave (CDW) instability. BCS-type superconductivity with two subsequent transitions at $T_{c1}=1.67$K and $T_{c2}$=1.33K are observed in this compound. Thus, BaPt$_2$As$_2$ may serve as a new system for studying the interplay of superconductivity and the CDW order.

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