论文标题
预测在中等压力下稀土Hydride ERH2的高温超导性
Predicted high-temperature superconductivity in rare earth hydride ErH2 at moderate pressure
论文作者
论文摘要
Hydrides提供了在实验可实现的压力下研究高温（TC）超导性的机会。但是，它们仍然很高。使用密度函数理论计算，我们在此证明了新稀土的氢化物，即散装ERH2，可以在14.5 GPA时与大约80 K的TC进行超导。迄今为止，驾驶压力是压缩氢化物的最低报告值。除了超导性外，费米表面嵌套和围绕效应在这种压力下也表现出来。有趣的是，由于近代破坏，超导性在15 GPA时很容易存在。在其余的施加压力下，我们还揭示了在正常金属状态的背景下20 GPA处的带结构间隙。在20 GPA时，这种压缩系统可以用作一大批超导体，从自发性磁敏感性的急剧跳跃中，在费米水平的evanevencent旋转状态密度以及自旋密度波和超导能力之间的竞争之间。最后，ERH2在这三个典型压力下的电子配对胶归因于抗磁性自旋波动。
Hydrides offer an opportunity to study high-temperature (Tc) superconductivity at experimentally achievable pressures. However, they remained extremely high. Using density functional theory calculations, herein we demonstrated that a newly rare earth hydride, namely bulk ErH2, could be superconducting with a Tc around 80 K at 14.5 GPa. To date, the drived pressure is the lowest reported value for compressed hydrides. Besides superconductivity, Fermi Surface nesting and Kondo effect were manifested at this pressure. Intriguingly, due to Kondo destruction, superconductivity was prone to exist at 15 GPa. Under the rest of applied pressures, we also revealed a gap of band structure at 20 GPa on the background of normal metallic states. At 20 GPa, this compressed system could act as a host of superconductor being judged from a sharp jump of spontaneous magnetic susceptibility with an evanescent spin density of state at Fermi level along with the competition between spin density wave and superconductivity. Finally, electron pairing glue for ErH2 at these three typical pressures was attributed to the antiferromagnetic spin fluctuation.
