High-pressure effects in anti-post-perovskite superconductors V3PnNx (Pn = P, As)
High-pressure effects in anti-post-perovskite superconductors V3PnNx (Pn = P, As)
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反后钙钛矿超导体 V3PnNx (Pn = P, As) 中的高压效应
DOI：
10.1103/physrevb.89.144510
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and K. Ohgushi
中科院分区：
文献类型：
--
作者：
B. S. Wang;J.-G. Cheng;K. Matsubayashi;Y. Uwatoko;and K. Ohgushi
研究了压力对具有反后钙钛矿结构的Pn(Pn=P和As)超导体的影响。结果表明，对于Pn=P和As，随着压力的增加，超导转变温度()分别以负压差系数()/dp=−和−0.013 kK/Gpa减小。这与其他具有三维晶体结构的钒基超导体的正压差系数形成了鲜明的对比。压力下观测到的变化与正常态电阻率的演化密切相关。结果支持声子介导的Pn超导电性。
Pressure effects on the superconductorsPn(Pn= P and As) with the two-dimensional anti-post-perovskite structure were investigated. It was found that with increasing pressure, the superconducting transition temperature () decreases with a negative differential pressure () coefficient/dP= −0.19 and −0.013 K/GPa forPn= P and As, respectively. This is in marked contrast to the positive differential pressure coefficients reported for other vanadium-based superconductors with a three-dimensional crystal structure. The observed change inunder pressure is revealed to be closely correlated with the evolution of the normal-state resistivity. The results support the phonon-mediated superconductivity inPn.