The transition temperature (Tc) between normal and superconducting states usually exhibits a dramatic increase or decrease with increasing applied pressure. Here we present, in contrast, a new kind of superconductor that exhibits the exotic feature that Tc is robust against large volume shrinkages induced by applied pressure (here naming them as “RSAVS superconductors”). Extraordinarily, the Tc in these materials stays almost constant over a large pressure range, e.g. over 136 GPa in the (TaNb)0.67(HfZrTi)0.33 high entropy alloy and 141 GPa in the NbTi commercial alloy. We show that the RSAVS behavior also exists in another high entropy alloy (ScZrNbTa)0.6(RhPd)0.4, and in superconducting elemental Ta and Nb, indicating that this behavior, which has never previously been identified or predicted by theory, occurs universally in some conventional superconductors. Our electronic structure calculations indicate that although the electronic density of state (DOS) at the Fermi level in the RSAVS state is dominated by the electrons from the degenerate dxy, dxz and dyz orbitals, these electrons decrease in influence with increasing pressure. In contrast, however, the contribution of the degenerate dx2-y2 and dz2 orbital electrons remains almost unchanged at the Fermi level, suggesting that these are the electrons that may play a crucial role in stabilizing the Tc in the RSAVS state.

中文翻译：

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RSAVS超导体：具有超导状态的材料，可抵抗大体积收缩

正常状态和超导状态之间的转变温度（Tc）通常随施加压力的增加而急剧增加或降低。相反，在这里，我们展示了一种新型的超导体，该超导体表现出奇特的特征，即Tc可以抵抗施加压力引起的大体积收缩（此处将其命名为“ RSAVS超导体”）。尤其是，这些材料中的Tc在较大的压力范围内几乎保持恒定，例如，高（TaNb）0.67（HfZrTi）0.33熵合金中的136 GPa和NbTi商业合金中的141 GPa。我们证明了RSAVS行为还存在于另一种高熵合金（ScZrNbTa）0.6（RhPd）0.4中，并且存在于超导元素Ta和Nb中，表明这种行为以前从未通过理论确定或预测过，在某些常规超导体中普遍存在。我们的电子结构计算表明，尽管在RSAVS状态下费米能级的电子态密度（DOS）由退化的dxy，dxz和dyz轨道的电子控制，但这些电子的影响随着压力的增加而减小。但是，与此相反，简并的dx2-y2和dz2轨道电子的贡献在费米能级几乎保持不变，这表明这些电子可能在稳定RSAVS状态的Tc方面起关键作用。这些电子随着压力的增加而减小。但是，与此相反，简并的dx2-y2和dz2轨道电子的贡献在费米能级几乎保持不变，这表明这些电子可能在稳定RSAVS状态的Tc方面起关键作用。这些电子的影响随着压力的增加而减小。但是，与此相反，简并的dx2-y2和dz2轨道电子的贡献在费米能级几乎保持不变，这表明这些电子可能在稳定RSAVS状态的Tc方面起关键作用。