通过在 LaO0.5F0.5BiS2 中取代 Sn 增强超导性和结构不稳定性

IF 1.5 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Journal of the Physical Society of Japan Pub Date : 2024-01-16 DOI:10.7566/jpsj.93.024707

Sora Kobayashi, Takeshi Hara, Kanako Noguchi, Tomoko Takeda, Ryosuke Kurihara, Atsushi Nomura, Satoshi Demura, Hiroshi Yaguchi, Hiroshi Sawa, Hideaki Sakata

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引用次数: 0

摘要

基于 BiS2 的层状超导体 La(O,F)BiS2 可通过载流子掺杂表现出超导性，其超导特性可通过施加静水压力或化学压力来改变。我们发现，在 LaO0.5F0.5BiS2 中用 Sn 部分取代 Bi 会引起结构相变，即从 P4/nmm 结构转变为 P21/m 结构。在这一结构相变附近出现了 Tc 约为 6 K 的体超导现象。我们还观察到 Tc 约为 8 K 的丝状超导电性，比未取代样品的 Tc 高出约三倍。这一发现为进一步提高该系统的超导转变温度提供了新的途径。

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Enhancement of Superconductivity and Structural Instability by Sn Substitution in LaO0.5F0.5BiS2

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 LaO_0.5F_0.5BiS₂ exhibits filamentary superconductivity with T_c of approximately 3 K. We found that the partial substitution of Bi with Sn in LaO_0.5F_0.5BiS₂ induces a structural phase transition from the P4/nmm to P2₁/m structure. Bulk superconductivity with T_c of approximately 6 K emerged near this structural phase transition. We also observed filamentary superconductivity with T_c 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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来源期刊

Journal of the Physical Society of Japan 物理-物理：综合

CiteScore

3.40

自引率

17.60%

发文量

325

审稿时长

3 months

期刊介绍： The papers published in JPSJ should treat fundamental and novel problems of physics scientifically and logically, and contribute to the development in the understanding of physics. The concrete objects are listed below. Subjects Covered JPSJ covers all the fields of physics including (but not restricted to) Elementary particles and fields Nuclear physics Atomic and Molecular Physics Fluid Dynamics Plasma physics Physics of Condensed Matter Metal, Superconductor, Semiconductor, Magnetic Materials, Dielectric Materials Physics of Nanoscale Materials Optics and Quantum Electronics Physics of Complex Systems Mathematical Physics Chemical physics Biophysics Geophysics Astrophysics.