Tunneling Gap as Evidence for Time-Reversal Symmetry Breaking at Surfaces of High-Temperature Superconductors

Abstract

It is argued that recent Josephson junction and point-contact tunneling experiments, interpreted as intended by their authors, indicate that time-reversal symmetry breaking occurs at surfaces of cuprate superconductors. The variation among experiments and the failure of previous searches to find $T$-violation are ascribed to disorder and effects of 3-dimensionality. The ``anyon" approach to the $t$-$J$ model is shown to predict a conventional BCS order parameter of $d_{x^2-y^2}+i\epsilon d_{xy}$ symmetry, with $\epsilon$ roughly 3 times the doping fraction $\delta$, which is consistent with these experiments but not demonstrated by them.

REVTex 3.0, 11 pages, no figures

References in corpus (4)

• One-Loop N Gluon Amplitudes with Maximal Helicity Violation via Collinear Limits
• Predictions for Impurity-Induced Tc Suppression in the High-Temperature Superconductors
• Indications of d_{x^2 - y^2} Superconductivity in the Two Dimensional t-J Model
• Bogoliubov Quasiparticle Excitations in the Two-Dimensional t-J Model

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