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

Annica M. Black-Schaffer; Dmitri S. Golubev; Thilo Bauch; Floriana Lombardi; Mikael Fogelström

doi:10.1103/PhysRevLett.110.197001

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

Annica M. Black-Schaffer, Dmitri S. Golubev, Thilo Bauch, Floriana Lombardi, Mikael Fogelström

DOI 10.1103/PhysRevLett.110.197001 · Physical Review Letters

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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+is or dx2−y2+idxy. We find that a surface-induced dx2−y2+is phase creates a global spectroscopic gap which increases with an applied magnetic field, consistent with experimental observation.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown