Recent Advances in Layered Metal Chalcogenides as Superconductors and Thermoelectric Materials: Fe‐Based and Bi‐Based Chalcogenides
Authors:
Yoshikazu Mizuguchi
Affiliation:
Department of Electrical and Electronic Engineering, Tokyo Metropolitan University, Hachioji 192‐0397, Japan
Abstract:
Recent advances in layered (Fe‐based and Bi‐based) chalcogenides as superconductors or functional materials are reviewed. The Fe–chalcogenide (FeCh) family are the simplest Fe‐based high‐Tc superconductors. The superconductivity in the FeCh family is sensitive to external or chemical pressure, and high Tc is attained when the local structure (anion height) is optimized. The Bi–chalcogenide (BiCh2) family are a new group of layered superconductors with a wide variety of stacking structures. Their physical properties are also sensitive to external or chemical pressure. Recently, we revealed that the emergence of superconductivity and the Tc in this family correlate with the in‐plane chemical pressure. Since the flexibility of crystal structure and electronic states are an advantage of the BiCh2 family for designing functionalities, I briefly review recent developments in this family as not only superconductors but also other functional materials.
