Surface region enhanced superconductivity in high-Tc cuprates

Authors: Xian Yang Tee, T. Ito, T. Ushiyama, Y. Tomioka, I. Martin, and Christos Panagopoulos

Published in: Phys. Rev. B 95, 054516, 2017.

We present experimental evidence for the presence of a ab-plane surface superconducting transition Tcs which is considerably higher than the known bulk Tc in single crystal La-Ba-Cu-O. Across the range of charge carrier concentration studied in this work, the effect is pronounced when multiple correlated electronic/structural orders are simultaneously present, pointing at strong correlations as the key ingredient. Our findings indicate crystal surfaces can be the locus of nontrivial interplay of superconducting and non-superconducting orders.

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