It was recently pointed out that so-called “superhydrides”, hydrogen-rich materials that appear to become superconducting at high temperatures and pressures, exhibit physical properties that are different from both conventional and unconventional standard type I and type II superconductors [1,2]. Here we consider magnetic field expulsion in the first material in this class discovered in 2015, sulfur hydride [3]. A nuclear resonant scattering experiment has been interpreted as demonstration that the Meissner effect takes place in this material [4,5]. Here we point out that the observed effect, under the assumption that the system is in thermodynamic equilibrium, implies a Meissner pressure [6] in this material that is much larger than that of standard superconductors. This suggests that hydride superconductors are qualitatively different from the known standard superconductors if they are superconductors.

最近有人指出，所谓的“超氢化物”，即在高温和高压下似乎变成超导的富氢材料，其物理特性不同于常规和非常规的标准 I 型和 II 型超导体 [1,2 ]。在这里，我们考虑 2015 年发现的此类中的第一种材料，即氢化硫 [3] 中的磁场驱逐。核共振散射实验被解释为证明迈斯纳效应发生在这种材料中 [4,5]。在此我们指出，在系统处于热力学平衡的假设下，观察到的效应意味着该材料中的迈斯纳压力 [6]大得多与标准超导体相比。这表明氢化物超导体与已知的标准超导体在性质上不同，如果它们是超导体。