Here, we systematically investigated the pressure dependence of electronic transport and the crystal structure of GeTe using multiple methods under various hydrostatic conditions. The experiments indicated that a progressive structural evolution occurred from the ambient rhombohedral phase (space group [SG]: R3m) to the rock-salt phase (SG: Fm3̅m) and then to an orthorhombic phase (SG: Pnma). Above 50 GPa, we determined that GeTe developed into a body-centered cubic (bcc, SG: Im3̅m) structure, which consisted of a site-disordered alloy. An unambiguous correlation between superconductivity and phase transitions was observed in this compound, and the maximum superconducting transition temperature (T_c) was approximately 7.5 ± 0.2 K at 30.0(1) GPa. Finally, the key effect of ionic size and charge transfer between the Ge and Te ions on the formation of site-disordered alloys in GeTe was discussed.

中文翻译：

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GeTe 中的压力诱导合金化和超导性

在这里，我们在各种静水条件下使用多种方法系统地研究了电子传输的压力依赖性和 GeTe 的晶体结构。实验表明，从周围菱面体相（空间群[SG]：R 3 m）到岩盐相（SG：Fm 3̅ m），然后到斜方相（SG：Pnma），发生了渐进的结构演化。在 50 GPa 以上，我们确定 GeTe 发展成体心立方（bcc，SG：Im 3̅ m）结构，由位点无序合金组成。在该化合物中观察到超导性和相变之间存在明确的相关性，并且在 30.0(1) GPa 下的最大超导转变温度 ( T _c ) 约为 7.5 ± 0.2 K。最后，讨论了离子尺寸以及Ge和Te离子之间的电荷转移对GeTe中位点无序合金形成的关键影响。