Surface, Interface, and Bulk Properties of High Tc Superconductors
Abstract
We have performed extensive studies of the Bi2Sr2CaCu2O8 material ever since its discovery in early 1988. Single crystals, polycrystalline pellets and thin film samples of the Bi2Sr2CaCu2O8 material were examined using various photoemission related techniques. Especially the single crystalline Bi2Sr2CaCu2O8 material was found to have an extraordinary inertness in ultrahigh vacuum conditions, allowing a detailed examination of the surface electronic structure. Consequently, most of our investigations were focused on the single crystalline materials. Low-Energy Electron Diffraction (LEED) was used to confirm the single crystallinity of the in situ cleaved crystals of Bi2Sr2CaCu2O8. Sharp diffraction spots indicative of long range periodicity were observed. The observed LEED pattern showed that the Bi2Sr2CaCu2O8 material preferentially cleaves parallel to the a-b plane. In addition, a superstructure was seen extending along one of the symmetry axes in the a-b plane. The superstructure was found to have a periodicity about 5 times as long as the cell dimensions of the a and b axes, in agreement with the bulk structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1989
- Accession Number
- ADA211490
Entities
People
- Barrett Wells
- Daniel Dessau
- Per Lindberg
- William E. Spicer
- Z. X. Shen
Organizations
- Stanford University