Title

Cation Termination At Ion-Polished and Chemically Etched (001)Yba 2Cu3O7 Crystal Surfaces: An Ion Channeling Study

Document Type

Article

Publication Date

12-1-1991

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.

DOI

10.1063/1.104515

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