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Hierarchies of length-scale based typology in anisotropic U(1) s-wave multiband superconductors
KTH, School of Engineering Sciences (SCI), Physics. University of Leeds, Leeds, LS2 9JT, United Kingdom.ORCID iD: 0000-0002-7923-5739
Univ Jyvaskyla, Dept Phys, POB 35 YFL, FI-40014 Jyvaskyla, Finland.;Univ Jyvaskyla, Nanosci Ctr, POB 35 YFL, FI-40014 Jyvaskyla, Finland..
KTH, School of Engineering Sciences (SCI), Physics, Statistical Physics.ORCID iD: 0000-0001-7593-4543
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 6, article id 064509Article in journal (Refereed) Published
Abstract [en]

Since Ginzburg and Landau's seminal work in 1950, superconducting states have been classified by the hierarchy of the fundamental length scales of the theory, the magnetic-field penetration lengths and coherence lengths. In the simplest single-component case they form a dimensionless ratio kappa. The model was generalized by Ginzburg for anisotropic materials in 1952. In this paper we expand the above length-scale analysis to anisotropic multicomponent superconductors that can have multiple coherence lengths as well as multiple magnetic-field penetration lengths, leading to unconventional length-scale hierarchies. We demonstrate that the anisotropies in multiband superconductors lead to new regimes with various mixed hierarchies in different directions. For example, a regime is possible, where for a field applied in a certain direction coherence lengths are smaller than the magnetic-field penetration lengths in one of the perpendicular directions, whereas the penetration lengths are larger in the other direction. Focusing on a model of a clean anisotropic multiband s-wave supercocoductors we show exampes of a new regime where vortex cores overlap in one direction, resulting in attractive core-core interaction, while in the orthogonal direction the magnetic-field penetration length exceeds the coherence lengths, leading to dominance of repulsive current-current interaction, resulting in an unconventional magnetic response.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 99, no 6, article id 064509
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-245914DOI: 10.1103/PhysRevB.99.064509ISI: 000459222700014Scopus ID: 2-s2.0-85061987792OAI: oai:DiVA.org:kth-245914DiVA, id: diva2:1296837
Note

QC 20190318

Available from: 2019-03-18 Created: 2019-03-18 Last updated: 2019-08-27Bibliographically approved

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