Observation of Surface-Induced Broken Time-Reversal Symmetry in YBa{sub 2}Cu{sub 3}O{sub 7} Tunnel Junctions
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208 (United States)
Data from ab -oriented YBa{sub 2}Cu {sub 3}O{sub 7}/I/Cu tunnel junctions are presented. Self-assembled monolayers form the insulating tunnel barrier, I. The YBa{sub 2}Cu {sub 3}O{sub 7} features in the tunneling conductance match those of low-leakage ab -oriented YBa{sub 2}Cu {sub 3}O{sub 7}/Pb junctions. Results show that the zero-bias conductance peak is an Andreev bound state (ABS) of a d -wave order parameter. In {ital zero} magnetic field, the ABS splits below {approximately}7 K , consistent with the presence of a subdominant order parameter at the surface. An applied magnetic field induces further splitting that grows nonlinearly with increasing field. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 549695
- Journal Information:
- Physical Review Letters, Vol. 79, Issue 2; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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