论文标题
Mo $ _5 $ PB $ _2 $ BORON-phosphorus化合物中的多映射超导率
Multigap superconductivity in the Mo$_5$PB$_2$ boron-phosphorus compound
论文作者
论文摘要
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.来自低温超流体密度和电子特异性热的数据表明，Mo $ _5 $ pb $ _2 $的无节性超导基态状态。需要两个超导能量差距$Δ_0$ = 1.02 meV（25％）和1.49 meV（75％）才能描述低$ t $ t $电子特异性热数据。电子特异性热系数和超导状态（即超氟密度）以及上临界场的温度依赖性的田间依赖性明显证明了多图特征。通过将我们广泛的实验结果与数值带结构计算相结合，我们提供了Mo $ $ _5 $ pb $ _2 $的多盖超导性的令人信服的证据。
The tetragonal Mo$_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$_2$.
