Mo $_5$ PB $_2$硼磷化合物的多能隙超导电性
Multigap superconductivity in the Mo$_5$PB$_2$ boron-phosphorus compound
摘要：
四元Mo $_5$ PB $_2$化合物最近被报道显示出超导电性，其临界温度高达9.2 K。为了寻找Mo $_5$ PB $_2$中存在多个超导能隙的证据，进行了综合测量，包括磁化率、电阻率、热容以及μ子自旋旋转和弛豫（$μ$ SR）测量。低温超流密度和电子比热的数据表明Mo $_5$ PB $_2$中存在无结超导基态。两个超导能隙$Δ_0$ = 1.02 meV（25%）和1.49 meV（75%），以描述低$T$电子比热数据。多能隙特征由超导状态下的电子比热系数和高斯弛豫速率的场依赖性清楚地证明（即，超流体密度），以及温度依赖性的上临界场。通过结合我们广泛的实验结果与数值能带结构计算，我们提供了令人信服的证据，多能隙超导钼$_5$ PB $_2$。
英文摘要：
The tetragonal Mo$_5$PB$_2$ compound was recently reported to show superconductivity with a critical temperature up to 9.2 K. In search of evidence for multiple superconducting gaps in Mo$_5$PB$_2$, comprehensive measurements, including magnetic susceptibility, electrical resistivity, heat capacity, and muon-spin rotation and relaxation ($μ$SR) measurements were carried out. Data from both low-temperature superfluid density and electronic specific heat suggest a nodeless superconducting ground state in Mo$_5$PB$_2$. Two superconducting energy gaps $Δ_0$ = 1.02 meV (25%) and 1.49 meV (75%) are required to describe the low-$T$ electronic specific-heat data. The multigap features are clearly evidenced by the field dependence of the electronic specific-heat coefficient and the Gaussian relaxation rate in the superconducting state (i.e., superfluid density), as well as by the temperature dependence of the upper critical field. By combining our extensive experimental results with numerical band-structure calculations, we provide compelling evidence of multigap superconductivity in Mo$_5$PB$_2$.
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