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- Black-Schaffer, Annica M., et al.
(author)
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Model Evidence of a Superconducting State with a Full Energy Gap in Small Cuprate Islands
- 2013
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In: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 110:19, s. 197001-
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Journal article (peer-reviewed)abstract
- We investigate subdominant order parameters stabilizing at low temperatures in nanoscale high-Tc cuprate islands, motivated by the recent observation of a fully gapped state in nanosized YBa2Cu3O7-δ[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 dx2-y2 þ is or dx2-y2 þ idxy. We find that a surface-induced dx2-y2 þ is phase creates a global spectroscopic gap which increases with an applied magnetic field, consistent with experimental observation.
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