Local tunneling probe of (110) Y0.95 Ca0.05 Ba 2Cu3 O7-δ thin films in a magnetic field

J. H. Ngai, R. Beck, G. Leibovitch, G. Deutscher, J. Y.T. Wei

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Abstract

Scanning tunneling spectroscopy was performed on (110)-oriented thin films of Ca-overdoped Y0.95 Ca0.05 Ba2 Cu3 O7-δ at 4.2 K, to probe the local evolution of Andreev-Saint-James surface states in a c -axis magnetic field. In zero field, we observed conductance spectra with spontaneously-split peaks and spectra with unsplit zero-bias peaks. The former showed enhanced splitting with field, and the latter showed threshold splitting above finite fields. Although both field evolutions can be described in terms of screening and orbital supercurrents, within the framework of d±iα pairing (d= dx2 - y2; α= dxy, s), the enhanced splitting is consistent with only the d+iα state. Our results have direct implications on the local stability of broken time-reversal symmetry in cuprate superconductors.

Original languageEnglish
Article number054505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number5
DOIs
StatePublished - 4 Aug 2010

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