The origin of the superstructure in Bi2 Sr2 CaCu 2 O8+δ as revealed by scanning tunneling microscopy

Journal Article

Real-space images with atomic resolution of the BiO plane of Bi 2Sr2CaCu2O8+δ 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.

Duke Authors

Cited Authors

  • Kirk, MD; Nogami, J; Baski, AA; Mitzi, DB; Kapitulnik, A; Geballe, TH; Quate, CF

Published Date

  • 1988

Published In

Volume / Issue

  • 242 / 4886

Start / End Page

  • 1673 - 1675

International Standard Serial Number (ISSN)

  • 0036-8075