Liu Supeng, Matsumoto Ryo, Jha Rajveer, Yamashita Aichi, Kawaguchi Saori I, Goto Yosuke, Takano Yoshihiko, Mizuguchi Yoshikazu
Department of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, 192-0397, Japan.
International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-1, Sengen, Tsukuba, 305-0047, Japan.
J Phys Condens Matter. 2021 May 7;33(22). doi: 10.1088/1361-648X/abe81b.
The effects of pressure on the superconducting properties of a Bi-based layered superconductor LaOBiAgSnS, which possesses a four-layer-type conducting layer, have been studied through the electrical resistance and magnetic susceptibility measurements. The crystal structure under pressure was examined using synchrotron x-ray diffraction at SPring-8. In the low-pressure regime, bulk superconductivity with a transition temperatureof ∼4.5 K was induced by pressure, which was achieved by in-plane chemical pressure effect owing to the compression of the tetragonal structure. In the high-pressure regime above 6.4 GPa, a structural symmetry lowering was observed, and superconducting transitions with a∼ 8 K were observed. Our results suggest the possible commonality on the factor essential forin Bi-based superconductors with two-layer-type and four-layer-type conducting layers.
通过电阻和磁化率测量，研究了压力对具有四层型导电层的铋基层状超导体LaOBiAgSnS超导性能的影响。利用SPring-8的同步辐射X射线衍射对压力下的晶体结构进行了研究。在低压区，通过四方结构的压缩产生的面内化学压力效应，压力诱导出了转变温度约为4.5K的体超导。在高于6.4GPa的高压区，观察到结构对称性降低，并观察到转变温度约为8K的超导转变。我们的结果表明，在具有两层型和四层型导电层的铋基超导体中，对其超导至关重要的因素可能具有共性。
