We report the discovery of superconductivity on high-quality single crystals of transition-metal pnictides WP grown by chemical vapor transport (CVT) method. Bulk superconductivity is observed at Tc = 0.84 K under ambient pressure by electrical resistivity and AC magnetic susceptibility 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 Hc2=172 Oe and Hc2\=85 Oe, respectively. Our finding demonstrates that WP is the first superconductor in 5d transition-metal at ambient pressure in MnP-type, which will help to search for new superconductors in transition-metal pnictides.
@article{arxiv.1901.04662,
title = {Superconductivity in the WP single crystal},
author = {Ziyi Liu and Wei Wu and Zhenzheng Zhao and Hengcan Zhao and Jian Cui and Pengfei Shan and Jiahao Zhang and Changli Yang and Peijie Sun and Yu Sui and Jinguang Cheng and Li Lu and Jianlin Luo and Guangtong Liu},
journal= {arXiv preprint arXiv:1901.04662},
year = {2019}
}