Recent discoveries of carbon-sulfur-hydrogen (C-S-H) room temperature superconductor (287.7 K) and near room temperature in hydride-based materials under high pressure have opened up an interesting and new avenue in the field of superconductivity. One of the important parameters of a superconductor is the coherence length, ξ which is the variation in the density of superconducting phase. ξ can also be related to the characteristic Cooper pair size. In this paper we report on the relation between ξ and the transition temperature, T_c of heavy fermions, conventional, iron arsenide-, cuprate- and hydride-based superconductors. This work showed that the coherence length was large for low T_c but for high T_c, ξ is short and tends to reach saturation value between 15 and 30 Å. ξ of the newly discovered hydride superconductors was found to be in the range of the cuprates. In this work, the coherence length of a 300 K superconductor extrapolated from the hydride-based data was found to be around 15 Å. This coherence length is sufficiently large to allow an effective Coulombic attraction between electrons in a Cooper pair.

在高压下氢化物基材料中碳硫氢（CSH）室温超导体（287.7 K）和接近室温的最新发现为超导领域开辟了有趣的新途径。超导体的重要参数之一是相干长度ξ，它是超导相密度的变化。ξ也可能与特征库珀对的大小有关。在本文中，我们报告了ξ与重费米，常规，砷化铁，铜酸盐和氢化物基超导体的转变温度T _c之间的关系。这项工作表明，相干长度对于低T _c而言较大，而对于高T _c而言，ξ短，趋于达到15到30Å之间的饱和度值。发现新发现的氢化物超导体的ξ在铜酸盐的范围内。在这项工作中，从基于氢化物的数据推断出的300 K超导体的相干长度约为15。该相干长度足够大以允许库珀对中的电子之间的有效库仑吸引。