High-pressure effects on superconducting properties and crystal structure of Bi-based layered superconductor La 2 O 2 Bi 3 Ag 0.6 Sn 0.4 S 6

• Published in: Journal of physics. Condensed matter Vol. 33; no. 22; p. 225702
• Main Authors: Liu, Supeng, Matsumoto, Ryo, Jha, Rajveer, Yamashita, Aichi, Kawaguchi, Saori I, Goto, Yosuke, Takano, Yoshihiko, Mizuguchi, Yoshikazu
• Format: Journal Article
• Language: English
• Published: England 02.06.2021
• Subjects: pressure effect; structural phase transition; layered superconductor; Bi-based superconductor; synchrotron XRD; diamond anvil cell
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/1361-648X/abe81b

The effects of pressure on the superconducting properties of a Bi-based layered superconductor La O Bi Ag Sn S , 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 temperature of ∼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 for in Bi-based superconductors with two-layer-type and four-layer-type conducting layers.