title: The Origin of the Superstructure in Bi2Sr2CaCu2O8+dgr as Revealed by Scanning Tunneling Microscopy.
abstract: Real-space images with atomic resolution of the BiO plane of Bi(2)Sr(2)CaCu(2)O(8+delta) were obtained with a scanning tunneling microscope. Single-crystal samples were cleaved and imaged under ultrahigh vacuum conditions at room temperature. The images clearly show the one-dimensional incommensurate superstructure along the b-axis that is common to this phase. High-resolution images show the position of the Bi atoms, revealing the structural nature of the superlattice. A missing row of Bi atoms occurs either every nine or ten atomic sites in both (110) directions, accounting for the measured incommensurate periodicity of the superstructure. A model is proposed that includes missing rows of atoms, as well as displacements of the atomic positions along both the a- and c-axis directions.
authors.forename: M D
authors.initials: MD
authors.lastname: Kirk
authors.forename: J
authors.initials: J
authors.lastname: Nogami
authors.forename: A A
authors.initials: AA
authors.lastname: Baski
authors.forename: D B
authors.initials: DB
authors.lastname: Mitzi
authors.forename: A
authors.initials: A
authors.lastname: Kapitulnik
authors.forename: T H
authors.initials: TH
authors.lastname: Geballe
authors.forename: C F
authors.initials: CF
authors.lastname: Quate