Observation of Surface-Induced Broken Time-Reversal Symmetry in YBa{sub 2}Cu{sub 3}O{sub 7} Tunnel Junctions

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.277· OSTI ID:549695

Covington, M; Aprili, M; Paraoanu, E; Greene, L H ^[1]; Xu, F; Zhu, J; Mirkin, C A ^[2]

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1. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
2. 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, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
BOUND STATE
COPPER OXIDES
D WAVES
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
QUASI PARTICLES
SUPERCONDUCTING JUNCTIONS
SURFACE PROPERTIES
SYMMETRY BREAKING
TUNNEL EFFECT
YTTRIUM OXIDES