Cation termination at ion-polished and chemically etched (001)YBa 2Cu3O7 crystal surfaces: An ion channeling study

A. T. Fiory, A. F. Hebard, R. H. Eick, L. F. Schneemeyer, J. V. Waszczak, H. J. Gossmann

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Abstract

Local cation order approaching ideal bulk termination was found for cleaned (001) surfaces of YBa2Cu3O7 crystals by ion-channeling surface-peak analysis. Surfaces etched in dilute CH 3OH:Br2 and ultrasonically agitated in CH3OH to dislodge the Br2 appear terminated preferentially by the Cu-O "double-plane" sequence, containing less than 1/2-cation monolayer of surface disorder. Planar polishing with ion beams incident at a glancing angle on a rotating crystal leaves residual disorder as low as ∼8 Å, damage which is readily removed by a light chemical etch.

Original languageEnglish
Pages (from-to)777-779
Number of pages3
JournalApplied Physics Letters
Volume58
Issue number7
DOIs
StatePublished - 1 Dec 1991

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