{"title":"Enhancement of Superconductivity and Structural Instability by Sn Substitution in LaO0.5F0.5BiS2","authors":"Sora Kobayashi, Takeshi Hara, Kanako Noguchi, Tomoko Takeda, Ryosuke Kurihara, Atsushi Nomura, Satoshi Demura, Hiroshi Yaguchi, Hiroshi Sawa, Hideaki Sakata","doi":"10.7566/jpsj.93.024707","DOIUrl":null,"url":null,"abstract":"Layered BiS<sub>2</sub>-based superconductor La(O,F)BiS<sub>2</sub> can exhibit superconductivity via carrier doping, and its superconducting properties can be changed by applying hydrostatic or chemical pressure through elemental substitution. Single-crystal LaO<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2</sub> exhibits filamentary superconductivity with <i>T</i><sub>c</sub> of approximately 3 K. We found that the partial substitution of Bi with Sn in LaO<sub>0.5</sub>F<sub>0.5</sub>BiS<sub>2</sub> induces a structural phase transition from the <i>P</i>4/<i>nmm</i> to <i>P</i>2<sub>1</sub>/<i>m</i> structure. Bulk superconductivity with <i>T</i><sub>c</sub> of approximately 6 K emerged near this structural phase transition. We also observed filamentary superconductivity with <i>T</i><sub>c</sub> of approximately 8 K, which was approximately three times higher than that of the unsubstituted sample. This finding provides a new route for further increasing the superconducting transition temperature of this system.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"164 1","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Physical Society of Japan","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.7566/jpsj.93.024707","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
Layered BiS2-based superconductor La(O,F)BiS2 can exhibit superconductivity via carrier doping, and its superconducting properties can be changed by applying hydrostatic or chemical pressure through elemental substitution. Single-crystal LaO0.5F0.5BiS2 exhibits filamentary superconductivity with Tc of approximately 3 K. We found that the partial substitution of Bi with Sn in LaO0.5F0.5BiS2 induces a structural phase transition from the P4/nmm to P21/m structure. Bulk superconductivity with Tc of approximately 6 K emerged near this structural phase transition. We also observed filamentary superconductivity with Tc of approximately 8 K, which was approximately three times higher than that of the unsubstituted sample. This finding provides a new route for further increasing the superconducting transition temperature of this system.
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