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Science 23 December 1988:
Vol. 242. no. 4886, pp. 1673 - 1675
DOI: 10.1126/science.242.4886.1673
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Articles

The Origin of the Superstructure in Bi2Sr2CaCu2O8+dgr as Revealed by Scanning Tunneling Microscopy

M. D. Kirk 1, J. Nogami 1, A. A. Baski 1, D. B. Mitzi 1, A. Kapitulnik 1, T. H. Geballe 1, and C. F. Quate 1

1 Department of Applied Physics, Stanford University, Stanford, CA 94305

Real-space images with atomic resolution of the BiO plane of Bi2Sr2CaCu2O8+dgr 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.

Submitted on October 27, 1988
Accepted on November 18, 1988


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Science. ISSN 0036-8075 (print), 1095-9203 (online)