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Title: Surface structure of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta high-temperature superconductors studied using low-energy electron diffraction

Abstract

The surface structure of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta has 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 A, 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.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford University, Stanford, California 94305
OSTI Identifier:
6886151
Resource Type:
Journal Article
Journal Name:
Appl. Phys. Lett.; (United States)
Additional Journal Information:
Journal Volume: 53:25
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BISMUTH OXIDES; SURFACE PROPERTIES; TOPOGRAPHY; CALCIUM OXIDES; COPPER OXIDES; STRONTIUM OXIDES; CRYSTAL STRUCTURE; ELECTRON DIFFRACTION; SUPERCONDUCTORS; SUPERLATTICES; SURFACES; ALKALINE EARTH METAL COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; COPPER COMPOUNDS; DIFFRACTION; OXIDES; OXYGEN COMPOUNDS; SCATTERING; STRONTIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 656100 - Condensed Matter Physics- Superconductivity

Citation Formats

Lindberg, P A.P., Shen, Z, Wells, B O, Mitzi, D B, Lindau, I, Spicer, W E, and Kapitulnik, A. Surface structure of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta high-temperature superconductors studied using low-energy electron diffraction. United States: N. p., 1988. Web. doi:10.1063/1.100532.
Lindberg, P A.P., Shen, Z, Wells, B O, Mitzi, D B, Lindau, I, Spicer, W E, & Kapitulnik, A. Surface structure of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta high-temperature superconductors studied using low-energy electron diffraction. United States. doi:10.1063/1.100532.
Lindberg, P A.P., Shen, Z, Wells, B O, Mitzi, D B, Lindau, I, Spicer, W E, and Kapitulnik, A. Mon . "Surface structure of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta high-temperature superconductors studied using low-energy electron diffraction". United States. doi:10.1063/1.100532.
@article{osti_6886151,
title = {Surface structure of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta high-temperature superconductors studied using low-energy electron diffraction},
author = {Lindberg, P A.P. and Shen, Z and Wells, B O and Mitzi, D B and Lindau, I and Spicer, W E and Kapitulnik, A},
abstractNote = {The surface structure of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub delta has 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 A, 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.},
doi = {10.1063/1.100532},
journal = {Appl. Phys. Lett.; (United States)},
number = ,
volume = 53:25,
place = {United States},
year = {1988},
month = {12}
}