Coupled structural and electronic evolution under pressure in CuIr2Se4, CuRh2S4, and CuRh2Se4
This study combines high-pressure structural and transport measurements to reveal that CuIr2Se4, CuRh2S4, and CuRh2Se4 undergo closely related monoclinic structural transformations that drive insulating behavior, while also discovering ambient-pressure superconductivity in CuIr2Se4, thereby demonstrating how chemical substitution tunes the competition between superconductivity and pressure-induced insulating states.