Cation termination at ion-polished and chemically etched (001)YBa2Cu3O7 crystal surfaces: An ion channeling study
- 18 February 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 58 (7) , 777-779
- https://doi.org/10.1063/1.104515
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 CH3OH: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.Keywords
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