Journal
PHYSICA B-CONDENSED MATTER
Volume 280, Issue 1-4, Pages 159-164Publisher
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DOI: 10.1016/S0921-4526(99)01549-5
Keywords
Andreev bound states; broken time-reversal symmetry; order parameter; thin films; tunnel junctions spectroscopy; unconventional superconductivity
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Quasiparticle (QP) planar tunneling spectroscopy is used to investigate the density of states (DoS) of YBa2Cu2O7 (YBCO). Temperature, crystallographic orientation, doping, damage and magnetic field dependencies confirm that the observed zero-bias conductance peak (ZBCP) is an Andreev bound state (ABS), an intrinsic property of a d-wave superconducting order parameter (OP) at an interface. In zero applied field, the splitting of the ZBCP below similar to 8K confirms a near-surface phase transition into a superconducting state with spontaneously broken time-reversal symmetry (BTRS). Tunneling into the ABS provides a phase-sensitive spectroscopy that can be used to measure a variety of DoS properties in an unconventional superconductor. (C) 2000 Elsevier Science B.V. All rights reserved.
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