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Superconductivity in La2O2M4S6 -Type Bi-based Compounds: A Review on Element Substitution Effects

Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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Condens. Matter 2020, 5(2), 27; https://doi.org/10.3390/condmat5020027
Received: 13 February 2020 / Revised: 23 March 2020 / Accepted: 5 April 2020 / Published: 6 April 2020
(This article belongs to the Special Issue Layered Superconductors II)
Since 2012, layered compounds containing Bi-Ch (Ch: S and Se) layers have been extensively studied in the field of superconductivity. The most-studied system is BiS2-based superconductors with two-layer-type conducting layers. Recently, superconductivity was observed in La2O2M2S6 (M = metals), which contains four-layer-type conducting layers. The four-layer-type Bi-based superconductors are new systems in the family of Bi-based superconductors; we can expect further development of Bi-based layered superconductors. In this review article, we summarize the progress of synthesis, structural analysis, investigations on superconducting properties, and material design of the four-layer-type Bi-based superconductors. In-plane chemical pressure is the factor essential for the emergence of bulk superconductivity in the system. The highest Tc of 4.1 K was observed in Rare Earth elements (RE) substituted La2-xRExO2Bi3Ag0.6Sn0.4S6. View Full-Text
Keywords: Bi-based superconductors; layered superconductor; chemical pressure; substitution effect; superconducting phase diagram Bi-based superconductors; layered superconductor; chemical pressure; substitution effect; superconducting phase diagram
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Jha, R.; Mizuguchi, Y. Superconductivity in La2O2M4S6 -Type Bi-based Compounds: A Review on Element Substitution Effects. Condens. Matter 2020, 5, 27.

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