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X-ray and electron diffraction study of single crystal Bi2Sr2CaCu2Ox

Published online by Cambridge University Press:  31 January 2011

X. B. Kan
Affiliation:
Physics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5504
J. Kulik
Affiliation:
Physics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5504
P. C. Chow
Affiliation:
Physics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5504
S. C. Moss
Affiliation:
Physics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5504
Y. F. Yan
Affiliation:
Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, People's Republic of China
J. H. Wang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, People's Republic of China
Z. X. Zhao
Affiliation:
Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, People's Republic of China
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Abstract

Using both x-ray and electron diffraction, we have studied the incommensurate modulation structure in single crystal Bi2Sr2CaCu2Ox. Electron diffraction clearly indicates a small a∗-axis component of the modulation wave vector k, along with the more familiar b∗-axis component (0.004a∗ + 0.212b∗). This tilt of the k-vector breaks the mirror symmetry perpendicular to a- and b-axes as well as the twofold symmetry about a- and b-axes. The modulated structure thereby has only a mirror plane normal to the c-axis. Intense x-ray streaking along the c-axis at several satcllite reflections was considerably more pronounced than at the fundamental reflections, indicating a stacking disorder along the c-axis predominantly in the modulated structure.

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Copyright
Copyright © Materials Research Society 1990

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