Superconductivity in WP single crystals

Article

关键词: STRUCTURAL-PROPERTIES;    TRANSITIONS;    PHOSPHIDES;   

DOI  :  10.1103/PhysRevB.99.184509

来源: SCIE

【 摘 要 】

We report the discovery of superconductivity in high-quality single crystals of transition-metal pnictides WP grown by chemical vapor transport method. Bulk superconductivity is observed at T-c similar to 0.8 K at ambient pressure by electrical resistivity, ac magnetic susceptibility, and specific-heat measurements. The effects of magnetic field on the superconducting transitions are studied, leading to a large anisotropy parameter around 2 with the in-plane and out-of-plane upper critical fields of mu H-0(c2,parallel to) = 17.2 mT and mu H-0(c2,perpendicular to) = 8.5 mT, respectively. The low value of electron-phonon coupling estimated from the normal-state resistivity and specific-heat measurements suggest that WP is a weak-coupling BCS superconductor. Our finding demonstrates that WP is the first superconductor among 5d-transition metal pnictides with MnP-type structure at ambient pressure, which will help in the search for new superconductors in transition-metal pnictides.

【 授权许可】

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