论文标题
具有退化激发差距的多型超导体
Multiband superconductors with degenerate excitation gaps
论文作者
论文摘要
有一个默示的假设，即多次超导体与多绘制超导体基本相同。更确切地说，通常假定均匀超导体的单粒子能谱中的激发隙数确定相应超导模型中的贡献带的数量。在这里，我们证明了与这种广泛接受的观点相反，即使在相应的激发差距是退化并且无法区分的情况下，超导磁性能也对贡献带的数量敏感。特别是，我们发现超导性I和II类型（II -II（II）之间的交叉跨度在多个促进冷凝物的特征长度之间的差异强烈影响。这样做的原因是，在一个系统中具有不同特征长度的凝结性，在一个系统中共存或破坏性，这会导致多强度的磁现象，无论单粒子激发光谱中多绘制结构的存在/不存在。
There is a tacit assumption that multiband superconductors are essentially the same as multigap superconductors. More precisely, it is usually assumed that the number of excitation gaps in the single-particle energy spectrum of a uniform superconductor determines the number of contributing bands in the corresponding superconducting model. Here we demonstrate that contrary to this widely accepted viewpoint, the superconducting magnetic properties are sensitive to the number of contributing bands even when the corresponding excitation gaps are degenerate and cannot be distinguished. In particular, we find that the crossover between superconductivity types I and II - the intertype regime - is strongly affected by difference between characteristic lengths of multiple contributing condensates. The reason for this is that condensates with diverse characteristic lengths coexisting in one system interfere constructively or destructively, which results in multi-condensate magnetic phenomena regardless of the presence/absence of the multigap structure in the single-particle excitation spectrum.
