The pressure-induced superconductor-to-semiconductor transition suggests the competition between the supercondcting Cooper pairs and the small bipolarons, implying that the system has rather strong electron-phonon coupling.

• 压力导致的超导体 半导体转变显示出超导Cooper对与小双极化子的竞争 ；暗示系统具有较强的电 声耦合 .