Model Evidence of a Superconducting State with a Full Energy Gap in Small Cuprate Islands

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.

Golubev, Dmitri S. (author)
Bauch, Thilo,1972Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bauch (author)
Lombardi, Floriana,1967Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lombardi (author)
Fogelström, Mikael,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)fogelstr (author)
Uppsala universitetMaterialteori (creator_code:org_t)

By the author/editor: Black-Schaffer, ...; Golubev, Dmitri ...; Bauch, Thilo, 19 ...; Lombardi, Floria ...; Fogelström, Mika ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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