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Model Evidence of a Superconducting State with a Full Energy Gap in Small Cuprate Islands
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2013 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 19, 197001- p.Article in journal (Refereed) Published
Abstract [en]

We investigate subdominant order parameters stabilizing at low temperatures in nanoscale high-T-c cuprate islands, motivated by the recent observation of a fully gapped state in nanosized YBa2Cu3O7-delta [D. Gustafsson et al., Nature Nanotech. 8, 25 (2013)]. Using complementary quasiclassical and tight-binding Bogoliubov-de Gennes methods, we show on distinctly different properties dependent on the symmetry being d(x2-y2) + is or d(x2-y2) + id(xy). We find that a surface-induced d(x2-y2) + is phase creates a global spectroscopic gap which increases with an applied magnetic field, consistent with experimental observation.

Place, publisher, year, edition, pages
2013. Vol. 110, no 19, 197001- p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-201789DOI: 10.1103/PhysRevLett.110.197001ISI: 000318657500011OAI: oai:DiVA.org:uu-201789DiVA: diva2:629616
Available from: 2013-06-17 Created: 2013-06-17 Last updated: 2017-12-06Bibliographically approved

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Black-Schaffer, Annica M.

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