中文

笼合物Y$_{3}$EuH$_{24}$的高温超导电性

超导电性 2024-09-06 v3

摘要

近期关于三元超氢化物理论预测及其后续实验验证进展,为我们带来了一类新型超导体,其有望实现最受期待的室温超导体的合成。受近期关于YH6_6和EuH6_6的高压实验启发,我们通过混合这两种化合物从理论上了检验其稳定性与超导电性。在此我们确定了在150-300 GPa压力范围内能保持热力学稳定性的四个相,即Fm3ˉmFm\bar{3}m-Y3_{3}EuH24_{24}CmmmCmmm-YEuH12_{12}CmmmCmmm-YEu3_{3}H24_{24}ImmmImmm-YEu3_{3}H24_{24}。其中,仅Fm3ˉmFm\bar{3}m-Y3_{3}EuH24_{24}能在所搜索压力范围内保持动力学稳定性。采用Allen-Dynes修正的McMillan公式计算了该相的超导电性,结果表明Y3_{3}EuH24_{24}在200 GPa下的预测超导转变温度TcT\rm_{c}接近220 K。Fm3ˉmFm\bar{3}m-Y3_{3}EuH24_{24}的对数平均声子频率ωlog\omega_{log}与YH6_{6}几乎相同,但其电声子耦合(EPC)常数λ\lambda略小于YH6_{6}的2.56,导致最终TcT_{c}值较低。

关键词

引用

@article{arxiv.2205.05906,
  title  = {High-$T\rm_{c}$ superconductivity of clathrate Y$_{3}$EuH$_{24}$},
  author = {Abdul Ghaffar and Peng Song and Kenta Hongo and Ryo Maezono},
  journal= {arXiv preprint arXiv:2205.05906},
  year   = {2024}
}

备注

The system involves europium, where ignoring f-electrons and inherent magnetism led to an overly high predicted Tc in superconductivity calculations. This discrepancy could diverge significantly from actual results. Due to increased computational demands and concerns about europium pseudopotentials, We retract the previously submitted preprint to prevent misguidance