Intertype superconductivity evoked by the interplay of disorder and multiple bands

doi:10.1007/s11467-023-1379-y

Front. Phys.

2024, Vol. 19

Issue (4) : 43205 https://doi.org/10.1007/s11467-023-1379-y

Intertype superconductivity evoked by the interplay of disorder and multiple bands

P. M. Marychev¹(

), A. A. Shanenko^1,², A. V. Vagov^1,²

¹. HSE University, 101000 Moscow, Russia
². Center for Advanced Mesoscience and Nanotechnology, MIPT, Dolgoprudny, 141700, Russia

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Abstract

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.

Keywords superconductivity disorder intertype superconductivity two-band model

Corresponding Author(s): P. M. Marychev

Issue Date: 19 January 2024

Cite this article:

P. M. Marychev,A. A. Shanenko,A. V. Vagov. Intertype superconductivity evoked by the interplay of disorder and multiple bands[J]. Front. Phys. , 2024, 19(4): 43205.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-023-1379-y
https://academic.hep.com.cn/fop/EN/Y2024/V19/I4/43205

Fig.1 The IT domain in the

κ

T

phase diagram. Panel (a) demonstrates the

τ

-derivatives of the GL critical parameters (for their definitions, see the text) versus the ratio

θ = D 2 / D 1

. Panels (b) and (c) show the IT domain in the

κ

T

plane for

θ = 5

and

200

; the upper boundary is given by

κ l i ∗ (T)

whereas the lower boundary is

κ 2 ∗ (T)

. We remark that for single-band superconductors, the experimental results for the boundaries of the IT domain are in good agreement with the calculations of the extended GL theory down to

T ～ 0.5 T c

[14], this is why our results in panels (b) and (c) are given by the dashed lines below

T = 0.5 T c

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