High-pressure effects on superconducting properties and crystal structure of Bi-based layered superconductor La2O2Bi3Ag0.6Sn0.4S6

Supeng Liu; Ryo Matsumoto; Rajveer Jha; Aichi Yamashita; Saori I Kawaguchi; Yosuke Goto; Yoshihiko Takano; Yoshikazu Mizuguchi

doi:10.1088/1361-648X/abe81b

High-pressure effects on superconducting properties and crystal structure of Bi-based layered superconductor La₂O₂Bi₃Ag_0.6Sn_0.4S₆

J Phys Condens Matter. 2021 May 7;33(22). doi: 10.1088/1361-648X/abe81b.

Authors

Supeng Liu¹, Ryo Matsumoto², Rajveer Jha^{1

3}, Aichi Yamashita¹, Saori I Kawaguchi⁴, Yosuke Goto¹, Yoshihiko Takano³, Yoshikazu Mizuguchi¹

Affiliations

¹ Department of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, 192-0397, Japan.
² International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-1, Sengen, Tsukuba, 305-0047, Japan.
³ International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1, Sengen, Tsukuba, 305-0047, Japan.
⁴ Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.

PMID: 33607634
DOI: 10.1088/1361-648X/abe81b

Abstract

The effects of pressure on the superconducting properties of a Bi-based layered superconductor La₂O₂Bi₃Ag_0.6Sn_0.4S₆, 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 temperatureT_cof ∼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 aT_c∼ 8 K were observed. Our results suggest the possible commonality on the factor essential forT_cin Bi-based superconductors with two-layer-type and four-layer-type conducting layers.

Keywords: Bi-based superconductor; diamond anvil cell; layered superconductor; pressure effect; structural phase transition; synchrotron XRD.