Material Development of High-Entropy-Alloy-Type Superconductors and Investigation of Physical Properties under High Pressure

Abstract

Since the discovery of superconductivity in a high-entropy alloy (HEA) Ti-Zr-Hf-Nb-Ta, we have developed HEA-type superconductors based on various electronic materials. Since compounds basically possess two or more crystallographic sites and characteristic chemical bonds, the modulation of local crystal structure and electronic states and the improvement of functionality are expected by the introduction of HEA-type site. In this paper, we introduce the variation of HEA-type superconductors and their unique superconducting properties are reviewed. Furthermore, the results of pressure effects on the crystal structure and the superconducting properties in HEA-type metal tellurides are reviewed.