Nonmagnetic impurity scattering is known to shift up the Ginzburg–Landau parameter κ of a superconductor. In this case, when the system is initially in type I, it can change its magnetic response, crossing the intertype domain with κ ∼ 1 between the two standard superconductivity types and arriving at type II. In the present work we demonstrate that the impact of disorder can be much more profound in the presence of the multiband structure of the charge carrier states. In particular, when the band diffusivities differ from each other, the intertype domain tends to expand significantly, including points with κ ≫ 1 that belong to deep type-II in conventional single-band superconductors. Our finding sheds light on the nontrivial disorder effect and significantly complements earlier results on the enlargement of the intertype domain in clean multiband superconductors.

众所周知，非磁性杂质散射会提高超导体的金兹堡-朗道参数κ 。在这种情况下，当系统最初处于 I 型时，它可以改变其磁响应，跨越两种标准超导类型之间κ ∼ 1 的型间域并到达 II 型。在目前的工作中，我们证明，在载流子态的多能带结构存在的情况下，无序的影响可能更加深远。特别是，当能带扩散率彼此不同时，型间域往往显着扩大，包括传统单带超导体中属于深II型的κ≥1的点。我们的发现揭示了非平凡的无序效应，并显着补充了早期关于清洁多带超导体中型间域扩大的结果。