标题： 为什么压缩的金属氢化物是近室温超导体 显示英文标题

标题： Why Compressed Metal Hydrides are Near-room-temperature Superconductors

摘要： 这一贡献部分回应了标题中的陈述，因为将声称，“为什么”尚不清楚，但存在一条实现更全面理解的路径。 社区的观点是，给定一种潜在的金属氢化物和压力，可以通过计算研究其能量景观以确定热力学和动力学稳定性，可以计算所需的输入（能带、声子模式、耦合矩阵元素）的Eliashberg谱函数，并获得临界温度T$_c$。 在高平均频率下获得了相当大的电子-声子耦合强度$\lambda$=2-3，与现有的高 T$_c$氢化物有非常合理的吻合。 通常，$\lambda$的80-85%归因于高频H振动。 这一点早在二十年前就由Ashcroft预见，那么为何还会有任何担忧呢？ 本文更具体地探讨了问题{\it 为什么是氢？}，轻质量确实是一个因素，但还有尚未探索的可能性。 本文提供了对过去数十年间偶尔出现的相关形式发展的简要概述，当实施时，这些发展可能解决{\it 为什么是氢，为什么如此高的 T$_c$.}的问题。 简要提及了许多高通量搜索在提出更高 T$_c$材料，特别是氢化物方面的成功不足。 基于尚未应用的简化原子位移效应的发展，提出了一种直接途径，以更深入地理解“金属氢超导性”，同时结合计算效率的提高，并认为某些人机学习应协助集中搜索更高 T$_c$超导体。 显示英文摘要

摘要： This contribution provides a partial response to the titular statement since, it will be claimed,the ``why'' is not yet understood, but there is a pathway for achieving a more complete understanding. The sense of the community has been that, given a prospective metal hydride and pressure, the energy landscape can be surveyed computationally for thermodynamic and dynamic stability, the Eliashberg spectral function with its required input (energy bands, phonon modes, coupling matrix elements) can be calculated, and the critical temperature T$_c$ obtained. Satisfyingly large values of the electron-phonon coupling strength $\lambda$=2-3 at high mean frequency are obtained, giving very reasonable agreement with existing high T$_c$ hydrides. Typically 80-85\% of $\lambda$ is attributable to high frequency H vibrations. This much was envisioned by Ashcroft two decades ago, so why should there be any angst? This paper addresses more specifically the question {\it why hydrogen?} Light mass is indeed a factor, but with possibilities not yet explored. This paper provides a concise overview of related formal developments occurring sporadically over several decades that, when implemented, could resolve the question of {\it why hydrogen, why so high T$_c$.} The dearth of success of numerous high throughput searches proposing higher T$_c$ materials, especially hydrides, is touched on briefly. Based on as yet unapplied developments in simplifying effects of atomic displacement, it is proposed that there is a straightforward path toward a deeper understanding of ``metallic hydrogen superconductivity" in conjunction with added computational efficiency, and that some human-learning should assist in focusing the search for higher T$_c$ superconductors.