We synthesized a series of Nb2Pd1−xRuxS5 polycrystalline samples by a solid-state reaction method and systematically investigated the Ru-doping effect on superconductivity by transport and magnetic measurements. It is found that superconductivity is enhanced with Ru doping and is quite robust upon disorder. Hall coefficient measurements indicate that the charge transport is dominated by hole-type charge carriers similar to the case of Ir doping, suggesting multi-band superconductivity. Upon Ru or Ir doping, \emph Hc2/Tc exhibits a significant enhancement, exceeding the Pauli paramagnetic limit value by a factor of approximately 4. A comparison of Tc and the upper critical field (Hc2) amongst the different doping elements on Pd site, reveals a significant role of spin--orbit coupling.
@article{arxiv.1611.03724,
title = {Enhanced superconductivity in hole-doped Nb$_{2}$PdS$_{5}$},
author = {Qian Chen and Xiaohui Yang and Xiaojun Yang and Jian Chen and Chenyi Shen and Pan Zhang and Yupeng Li and Qian Tao and Zhu-An Xu},
journal= {arXiv preprint arXiv:1611.03724},
year = {2017}
}