Superconductivity in hexagonal Nb-Mo-Ru-Rh-Pd high-entropy alloys

Bin Liu; Jifeng Wu; Yanwei Cui; Qinqing Zhu; Guorui Xiao; Siqi Wu; Guanghan Cao; Zhi Ren

Superconductivity in hexagonal Nb-Mo-Ru-Rh-Pd high-entropy alloys

Superconductivity 2020-03-19 v1

Authors: Bin Liu , Jifeng Wu , Yanwei Cui , Qinqing Zhu , Guorui Xiao , Siqi Wu , Guanghan Cao , Zhi Ren

Abstract

We report the superconducting properties of new hexagonal Nb $_{10+2x}$ Mo $_{35-x}$ Ru $_{35-x}$ Rh $_{10}$ Pd $_{10}$ high-entropy alloys (HEAs) (0 $\leq$ $x$ $\leq$ 5). With increasing $x$ , the superconducting transition temperature $T_{\rm c}$ shows a maximum of 6.19 K at $x$ = 2.5, while the zero-temperature upper critical field $B_{\rm c2}$ (0) increases monotonically, reaching 8.3 T at $x$ = 5. For all $x$ values, the specific heat jump deviates from the Bardeen-Cooper-Schreiffer behavior. In addition, we show that $T_{\rm c}$ of these HEAs is not determined mainly by the density of states at the Fermi level and would be enhanced by lowering the valence electron concentration.

Keywords

superconductivity high-temperature superconductivity hydrogen storage and hydrides

Cite

@article{arxiv.2003.08020,
  title  = {Superconductivity in hexagonal Nb-Mo-Ru-Rh-Pd high-entropy alloys},
  author = {Bin Liu and Jifeng Wu and Yanwei Cui and Qinqing Zhu and Guorui Xiao and Siqi Wu and Guanghan Cao and Zhi Ren},
  journal= {arXiv preprint arXiv:2003.08020},
  year   = {2020}
}

Superconductivity in hexagonal Nb-Mo-Ru-Rh-Pd high-entropy alloys

Abstract

Keywords

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