5 years ago

Superconductivity at 3.1 K in the orthorhombic ternary silicide ScRuSi.

Qing-Ge Mu, Zhi-An Ren, Xiao-Chuan Wang, Gen-Fu Chen, Bin-Bin Ruan, Jia Yu, Tong Liu, Bo-Jin Pan

We report the synthesis, crystal structure, superconductivity and physical property characterizations of the ternary equiatomic compound ScRuSi. Polycrystalline samples of ScRuSi were prepared by an arc-melting method. The as-prepared samples were identified as the orthorhombic Co2P-type o-ScRuSi by the powder X-ray diffraction analysis. Electrical resistivity measurement shows o-ScRuSi to be a metal which superconducts below a Tc of 3.1 K, and the upper critical field {\mu}0Hc2(0) is estimated to be 0.87 T. The magnetization and specific heat measurements confirm the bulk type-II superconductivity in o-ScRuSi, with the specific heat jump within the BCS weak coupling limit. o-ScRuSi is the first Co2P-type superconductor containing scandium. After annealing at 1273 K for a week, o-ScRuSi transforms into the hexagonal Fe2P-type h-ScRuSi, and the latter is a Pauli-paramagnetic metal with no superconductivity observed above 1.8 K.

Publisher URL: http://arxiv.org/abs/1711.05474

DOI: arXiv:1711.05474v1

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