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Vortex chains due to nonpairwise interactions and field-induced phase transitions between states with different broken symmetry in superconductors with competing order parameters
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.ORCID iD: 0000-0001-5087-3115
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, no 1, 014510- p.Article in journal (Refereed) Published
Abstract [en]

We study superconductors with two order components and phase separation driven by intercomponent densitydensity interaction, focusing on the phase where only one condensate has nonzero ground-state density and a competing order parameter exists only in vortex cores. We demonstrate there that multibody intervortex interactions can be strongly nonpairwise, leading to some unusual vortex patterns in an external field, such as vortex pairs and vortex chains. We demonstrate that in an external magnetic field such a system undergoes a field-driven phase transition from (broken) U(1) to (broken) U(1) x U(1) symmetries when a subdominant order parameter in the vortex cores acquires global coherence. Observation of these characteristic ordering patterns in surface probes may signal the presence of a subdominant condensate in the vortex core.

Place, publisher, year, edition, pages
2015. Vol. 91, no 1, 014510- p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-160386DOI: 10.1103/PhysRevB.91.014510ISI: 000348326200006Scopus ID: 2-s2.0-84921784510OAI: oai:DiVA.org:kth-160386DiVA: diva2:790896
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council, 642-2013-7837, 325-2009-7664
Note

QC 20150226

Available from: 2015-02-26 Created: 2015-02-19 Last updated: 2017-12-04Bibliographically approved

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Garaud, Julien

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