Superconductivity and multiple pressure-induced phases in BaPt2As2
Superconductivity and multiple pressure-induced phases in BaPt2As2
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BaPt2As2 中的超导性和多个压力诱导相
DOI：
10.1103/physrevb.94.184506
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发表时间：
2016
影响因子：
3.7
通讯作者：
Yuan H. Q.
中科院分区：
文献类型：
--
作者：
Guo C. Y.;Jiang W. B.;Smidman M.;Han F.;Malliakas C. D.;Shen B.;Wang Y. F.;Chen Y.;Lu X.;Kanatzidis M. G.;Yuan H. Q.
新发现的BaPt 2As 2在275 K附近出现结构畸变，随后在较低温度下出现超导电性。在这里，我们确定的电荷密度波（CDW）的存在下，在室温和环境压力下使用单晶X射线衍射，与超晶格和无公度调制，其中有一个变化的超晶格结构低于$\simeq $275 ~K。当施加压力时，BaPt$_2$As$_2$显示出富温-压力相图，在高温下具有多个压力诱导的转变，其出现或消失与超导转变温度T_c$的突然变化相关。这些发现表明BaPt$_2$As$_2$是研究竞争相互作用以及高温电子不稳定性与超导电性之间关系的一个很有前途的新体系。
The newly discovered BaPt$_2$As$_2$ shows a structural distortion at around 275~K, followed by the emergence of superconductivity at lower temperatures. Here we identify the presence of charge density wave (CDW) order at room temperature and ambient pressure using single crystal x-ray diffraction, with both a superlattice and an incommensurate modulation, where there is a change of the superlattice structure below $\simeq$ 275~K. Upon applying pressure, BaPt$_2$As$_2$ shows a rich temperature-pressure phase diagram with multiple pressure-induced transitions at high temperatures, the emergence or disappearance of which are correlated with sudden changes in the superconducting transition temperature $T_c$. These findings demonstrate that BaPt$_2$As$_2$ is a promising new system for studying competing interactions and the relationship between high-temperature electronic instabilities and superconductivity.