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Pressure-induced superconductivity in GeAs

机译：GEA中的压力诱导的超导性

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摘要

We performed high-pressure Raman and resistance measurements on a two-dimensional monoclinic semiconductor GeAs. We discovered a superconductivity that emerges after the insulator-metal transition above 10 GPa, which is related to the structural transition. Our results indicate that the semiconducting monoclinic phase and rocksalt structure phase coexist above 10 GPa and structural transformation to the rocksalt phase is completed above 17 similar to 18 GPa. The maximum superconducting transition temperature T-c is about 8 K close to the structural transition boundary, and the T-c is gradually decreasing at higher pressures. Upon pressure release, the nonpolar rocksalt structure transforms to a polar tetragonal superconducting phase. Our first-principles calculations indicate that the relatively high T-c in the rocksalt phase is mainly due to the enhancement of the electron-phonon coupling. These results show that superconductivity in this material strongly depends on its structure, achieving maximum T-c in a higher-symmetry phase.
机译：我们在二维单斜晶体半导体GEE上进行了高压拉曼和电阻测量。我们发现了在10GPa以上的绝缘金属转变后出现的超导性，这与结构转变有关。我们的结果表明，半导体单斜相和岩土结构相位在10GPa上方和对岩石阶段的结构转变的共存以上与18GPa类似的17个以上。最大超导转变温度T-C靠近结构转变边界约8k，并且T-C在更高的压力下逐渐减小。在压力释放时，非极性岩石结构变换为极间四方超导相。我们的第一原理计算表明，岩石局中相对高的T-C主要是由于电子 - 声子耦合的增强。这些结果表明，该材料中的超导性强烈取决于其结构，在更高对称相中实现最大T-C。

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  • 来源
    《Physical review》 |2019年第21期|214516.1-214516.6|共6页
  • 作者

    Liu Lixue; Struzhkin Viktor V.; Ying Jianjun;

  • 作者单位

    Univ Sci & Technol China Hefei Natl Lab Phys Sci Microscale Hefei 230026 Anhui Peoples R China|Univ Sci & Technol China Dept Phys Hefei 230026 Anhui Peoples R China;

    Ctr High Pressure Sci & Technol Adv Res Shanghai Peoples R China|Carnegie Inst Sci Geophys Lab Washington DC 20015 USA;

    Univ Sci & Technol China Hefei Natl Lab Phys Sci Microscale Hefei 230026 Anhui Peoples R China|Univ Sci & Technol China Dept Phys Hefei 230026 Anhui Peoples R China;

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