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Spontaneous splitting of d -wave surface states: Competition between circulating currents and edge magnetization
Department of Microtechnology and Nanoscience - MC2, Chalmers University of Technology, SE-41296 Göteborg, Sweden.
Department of Microtechnology and Nanoscience - MC2, Chalmers University of Technology, SE-41296 Göteborg, Sweden.
Department of Microtechnology and Nanoscience - MC2, Chalmers University of Technology, SE-41296 Göteborg, Sweden.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Department of Microtechnology and Nanoscience - MC2, Chalmers University of Technology, SE-41296 Göteborg, Sweden.ORCID iD: 0000-0003-3441-2559
2024 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 110, no 6, article id 064502Article in journal (Refereed) Published
Abstract [en]

Pair-breaking edges of d-wave superconductors feature Andreev bound states at the Fermi energy. Since these states are energetically highly unfavorable they are susceptible to effects that shift them to finite energy. We investigate the free energy of two different mechanisms: spontaneous phase gradients in the superconducting order parameter and surface ferromagnetism caused by Fermi liquid interaction effects. We find that the surface magnetization appears at lower temperatures than the spontaneous current flow of the phase-crystal state. The magnetic state can, however, be energetically favorable at lower temperatures for sufficiently strong Fermi liquid effects. Thus, first-order transitions between the two states as function of system temperature are possible, suggesting a rich low-temperature phase diagram in d-wave superconductors.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2024. Vol. 110, no 6, article id 064502
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-351905DOI: 10.1103/PhysRevB.110.064502ISI: 001284473700003Scopus ID: 2-s2.0-85200501108OAI: oai:DiVA.org:kth-351905DiVA, id: diva2:1890121
Note

QC 20240827

Available from: 2024-08-19 Created: 2024-08-19 Last updated: 2024-09-03Bibliographically approved

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Fogelström, Mikael

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