Superconductivity in Europium Bismuth Sulfofluorides




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Physical Society of Japan


The layered bismuth sulfofluorides EuBiS₂F and Eu₃Bi₂S₄F₄ show unique properties among all the BiS₂-based superconductors. Both compounds exhibit a possible charge-density-wave (CDW) instability around 280 K and undergo superconducting transitions at 0.3 and 1.5 K, respectively, without extrinsic doping. The self-doping effect due to the mixed valence state of Eu ions, which allows charge transfer from Eu to BiS₂ layers, accounts for the metallic behavior and superconductivity. Here we present a brief review of the research progress in these Eu-containing bismuth sulfofluorides, including the structure and electronic properties, external pressure effects, chemical pressure effects and doping effects. The results can provide important information towards a deeper understanding of BiS₂-based superconductors. ©2019 The Physical Society of Japan


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Superconductors, Bismuth sulfofluoride, Europium

National Natural Science Foundation of China (NSFC) (No. 11704311), the Natural Science Foundation of Shaanxi Provincial Department of Education (Grant No. 17JK0772) and Natural Science Foundation of Shaanxi Province (Program No. 2018JQ1069)


©2019 The Physical Society of Japan