Surface structure of Bi2Sr2CaCu2O8+δhigh-temperature superconductors studied using low-energy electron diffraction


Journal Article

The surface structure of Bi2Sr2CaCu2O8+δhas been studied using low-energy electron diffraction (LEED). Sharp diffraction spots indicative of a well-ordered surface are observed. The LEED patterns unequivocally show that this type of material preferentially cleaves along the a-b planes of the nearly tetragonal unit cell. A superstructure extending along one of the axes in the a-b plane (b) is found to have a periodicity of 27±0.5 Å, in good agreement with earlier studies of the three-dimensional crystal structure. We conclude that the superstructure at the surface is nonlocal in character and reflects the long-range superlattice of the bulk along the b axis. Intensity modulations of the diffraction spots oriented along the b axis are also reported and discussed in terms of the cell dimension of the unit cell along the b axis.

Full Text

Duke Authors

Cited Authors

  • Lindberg, PAP; Shen, ZX; Wells, BO; Mitzi, DB; Lindau, I; Spicer, WE; Kapitulnik, A

Published Date

  • 1988-12-01

Published In

Volume / Issue

  • 53 / 25

Start / End Page

  • 2563 - 2565

International Standard Serial Number (ISSN)

  • 0003-6951

Digital Object Identifier (DOI)

  • 10.1063/1.100532

Citation Source

  • Scopus