A key challenge in materials discovery is to find high-temperature superconductors. Hydrogen and hydride materials have long been considered promising materials displaying conventional phonon-mediated superconductivity. However, the high pressures required to stabilize these materials have restricted their application. Here, we present results from high-throughput computation, considering a wide range of high-symmetry ternary hydrides from across the periodic table at ambient pressure. This large composition space is then reduced by considering thermodynamic, dynamic, and magnetic stability before direct estimations of the superconducting critical temperature. This approach has revealed a metastable ambient-pressure hydride superconductor, ${\mathrm{Mg}}_2{\mathrm{IrH}}_6$, with a predicted critical temperature of 160 K, comparable to the highest temperature superconducting cuprates. We propose a synthesis route via a structurally related insulator, ${\mathrm{Mg}}_2{\mathrm{IrH}}_7$, which is thermodynamically stable above 15 GPa, and discuss the potential challenges in doing so.

中文翻译：

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高温常压氢化物超导的可行途径

材料发现的一个关键挑战是寻找高温超导体。氢和氢化物材料长期以来一直被认为是具有传统声子介导超导性的有前途的材料。然而，稳定这些材料所需的高压限制了它们的应用。在这里，我们展示了高通量计算的结果，考虑了环境压力下元素周期表中的各种高对称性三元氢化物。在直接估计超导临界温度之前，通过考虑热力学、动态和磁稳定性来减少这个大的成分空间。这种方法揭示了亚稳态环境压力氢化物超导体，${镁}_2{\mathrm{IRH}}_6$，预测临界温度为 160 K，与最高温度的超导铜氧化物相当。我们提出了一种通过结构相关的绝缘体的合成路线，${镁}_2{\mathrm{IRH}}_7$，其热力学稳定在 15 GPa 以上，并讨论这样做的潜在挑战。