Observation of broken time-reversal symmetry with Andreev bound state tunneling spectroscopy

L. H. Greene, M. Covington, M. Aprili, E. Badica, D. E. Pugel

Research output: Contribution to journalConference articlepeer-review


Quasiparticle (QP) planar tunneling spectroscopy is used to investigate the density of state (DoS) of YBa2Cu3O7 (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 approx. 8 K 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.

Original languageEnglish (US)
Pages (from-to)159-164
Number of pages6
JournalPhysica B: Condensed Matter
Issue number1-4
StatePublished - May 11 2000
Externally publishedYes
Event22nd International Conference on Low Temperature Physics (LT-22) - Helsinki, Finl
Duration: Aug 4 1999Aug 11 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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