Model Evidence of a Superconducting State with a Full Energy Gap in Small Cuprate Islands
2013 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 110, no 19, 197001- p.Article in journal (Refereed) Published
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.
IdentifiersURN: urn:nbn:se:uu:diva-201789DOI: 10.1103/PhysRevLett.110.197001ISI: 000318657500011OAI: oai:DiVA.org:uu-201789DiVA: diva2:629616