A1 Journal article (refereed)
Field-induced coexistence of s++ and s± superconducting states in dirty multiband superconductors (2018)

Garaud, J., Corticelli, A., Silaev, M., & Babaev, E. (2018). Field-induced coexistence of s++ and s± superconducting states in dirty multiband superconductors. Physical Review B, 97(5), 054520. https://doi.org/10.1103/PhysRevB.97.054520

JYU authors or editors

Publication details

All authors or editors: Garaud, Julien; Corticelli, Alberto; Silaev, Mikhail; Babaev, Egor

Journal or series: Physical Review B

ISSN: 2469-9950

eISSN: 2469-9969

Publication year: 2018

Volume: 97

Issue number: 5

Pages range: 054520

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevB.97.054520

Publication open access: Other way freely accessible online

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/57285

Web address where publication is available: https://arxiv.org/abs/1712.09273

Abstract

In multiband systems, such as iron-based superconductors, the superconducting states with locking and antilocking of the interband phase differences are usually considered as mutually exclusive. For example, a dirty two-band system with interband impurity scattering undergoes a sharp crossover between the s± state (which favors phase antilocking) and the s++ state (which favors phase locking). We discuss here that the situation can be much more complex in the presence of an external field or superconducting currents. In an external applied magnetic field, dirty two-band superconductors do not feature a sharp s±→s++ crossover but rather a washed-out crossover to a finite region in the parameter space where both s± and s++ states can coexist for example as a lattice or a microemulsion of inclusions of different states. The current-carrying regions such as the regions near vortex cores can exhibit an s± state while it is the s++ state that is favored in the bulk. This coexistence of both states can even be realized in the Meissner state at the domain's boundaries featuring Meissner currents. We demonstrate that there is a magnetic-field-driven crossover between the pure s± and the s++ states.

Keywords: superconductivity; superconductors

Free keywords: impurities in superconductors; multiband superconductivity; s-wave

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Ministry reporting: Yes

Reporting Year: 2018

JUFO rating: 2