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Skyrmion formation due to unconventional magnetic modes in anisotropic multiband superconductors

Winyard, Thomas, Silaev, Mihail, Babaev, Egor (2019) Skyrmion formation due to unconventional magnetic modes in anisotropic multiband superconductors. Physical Review B, 99 (2). Article Number 024501. ISSN 2469-9950. E-ISSN 2469-9969. (doi:10.1103/PhysRevB.99.024501) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:90667)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL:
https://doi.org/10.1103/PhysRevB.99.024501

Abstract

Multiband superconductors have a sufficient number of degrees of freedom to allow topological excitations characterized by skyrmionic topological invariants. In the most common, clean s-wave multiband systems, the interband Josephson and magnetic couplings favor composite vortex solutions, without a skyrmionic topological charge. It was discussed recently that certain kinds of anisotropies lead to hybridization of the interband phase difference (Leggett) mode with magnetic modes, dramatically changing the hydromagnetostatics of the system. Here we report this effect for a range of parameters that substantially alter the nature of the topological excitations, leading to solutions characterized by a nontrivial skyrmionic topological charge. The solutions have a form of a coreless texture formed of spatially separated but bound excitations in each band, namely fractional vortices, each carrying a fraction of the flux quantum. We demonstrate that in this regime there is a rich spectrum of skyrmion solutions, with various topological charges, that are robust with respect to changes of parameters of the system and present for a wide range of anisotropies.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.99.024501
Uncontrolled keywords: Multiband superconductivity; Superconductivity; Vortices in superconductors; Superconductors
Subjects: Q Science > QC Physics > QC20 Mathematical Physics
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Mathematics, Statistics and Actuarial Science
Depositing User: Amy Boaler
Date Deposited: 06 Oct 2021 14:44 UTC
Last Modified: 04 Mar 2024 19:56 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/90667 (The current URI for this page, for reference purposes)

University of Kent Author Information

Winyard, Thomas.

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