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Author Covington, M. ♦ Aprili, M. ♦ Paraoanu, E. ♦ Greene, L. H. ♦ Xu, F. ♦ Zhu, J. ♦ Mirkin, C. A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ HIGH-TC SUPERCONDUCTORS ♦ TUNNEL EFFECT ♦ SUPERCONDUCTING JUNCTIONS ♦ YTTRIUM OXIDES ♦ BARIUM OXIDES ♦ COPPER OXIDES ♦ BOUND STATE ♦ D WAVES ♦ MAGNETIC FIELDS ♦ QUASI PARTICLES ♦ SYMMETRY BREAKING ♦ SURFACE PROPERTIES
Abstract 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}
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1997-07-01
Publisher Place United States
Journal Physical Review Letters
Volume Number 79
Issue Number 2


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