Observation of surface-induced broken time-reversal symmetry in YBa2Cu3O7 tunnel junctions

M. Covington, M. Aprili, E. Paraoanu, L. H. Greene, F. Xu, J. Zhu, C. A. Mirkin

Research output: Contribution to journalArticlepeer-review


Data from ab-oriented YBa2Cu3O7/I/Cu tunnel junctions are presented. Self-assembled monolayers form the insulating tunnel barrier. I. The YBa2Cu3O7 features in the tunneling conductance match those of low-leakage ab-oriented YBa2Cu3O7/Pb junctions. Results show that the zero-bias conductance peak is an Andreev bound state (ABS) of a d-wave order parameter. In zero magnetic held, the ABS splits below ∼7 K, consistent with the presence of a subdominant order parameter at the surface. An applied magnetic held induces further splitting that grows nonlinearly with increasing field.

Original languageEnglish (US)
Pages (from-to)277-280
Number of pages4
JournalPhysical review letters
Issue number2
StatePublished - Jul 14 1997

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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