论文标题
多型超导体：每个促成冷凝水的两个特征长度
Multiband Superconductors: Two Characteristic Lengths for Each Contributing Condensate
论文作者
论文摘要
传统上，超导冷凝物的特征长度与相应间隙函数的空间分布有关。但是，超导冷凝物是库珀对的量子冷凝物，因此，更广泛的读者群对库珀对波功能的概念更熟悉。对于常规的单波段超导体，间隙函数与库珀对的质量中心波函数一致，直到耦合常数，相应的间隙和波功能特征长度相同。令人惊讶的是，我们发现在两波段超导体中，这些长度仅在临界温度附近相同。在较低的温度下，它们可能会显着彼此偏离，并且在指定多型和超导材料中带依赖带依赖的凝结物的空间尺度时，应给出这些长度中的哪一个。
Traditionally, the characteristic length of a superconducting condensate is associated with the spatial distribution of the corresponding gap function. However, the superconducting condensate is the quantum condensate of Cooper pairs and thus, the broader readership is more familiar with the concept of the Cooper-pair wave function. For conventional single-band superconductors, the gap function coincides with the center-of-mass wave function of a Cooper pair up to the coupling constant, and the corresponding gap- and wave-function characteristic lengths are the same. Surprisingly, we find that in two-band superconductors, these lengths are the same only near the critical temperature. At lower temperatures they can significantly deviate from each other, and the question arises as to which of these lengths should be given the preference when specifying the spatial scale of the band-dependent condensate in multiband superconducting materials.
