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Microanalysis of Cuprate Superconductors Using the Color of Polarization

Published online by Cambridge University Press:  28 February 2011

H.A. Hoff ,
W.L. Lechter ,
M.S. Osofsky  and
G.A. Candela
H.A. Hoff
Affiliation:
Naval Research Laboratory, Washington, DC 20375–5000
W.L. Lechter
Affiliation:
Sachs/Freeman Associates, Inc., Landover, MD 20875
M.S. Osofsky
Affiliation:
Naval Research Laboratory, Washington, DC 20375–5000
G.A. Candela
Affiliation:
Naval Research Laboratory, Washington, DC 20375–5000
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Abstract

A technique for the identification of individual anisotropic grains in a heterogeneous and opaque material involves the observation of grain color in a reflecting light optical microscope. Such colors are generally characteristic of particular phases. We have studied the presence of color in many superconducting cuprates and found a strong correlation between color and the existence of superconductivity. The change in color from insulator to superconductor facilitates the selection of grains for microanalysis. Color variations in a Tl-Sr-Ca-Cu-O material are investigated using quantitative energy dispersive x-ray spect-roscopy. Cation concentrations are found not to correlate with the changes in color. This apparent lack of correlation of color with composition is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 361
Copyright
Copyright © Materials Research Society 1990

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References

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