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Contrast enhancements due to superconductivity in scanning electron microscopy from Y1−x BaCu2+x Oy high Tc superconductors

Published online by Cambridge University Press:  31 January 2011

W. S. Millman ,
M. Ulla ,
Zhilan Han ,
M. Maclaurin  and
B. P. Tonner
W. S. Millman
Affiliation:
Laboratory for Surface Studies, University of Wisconsin-Milwaukee, 1900 E. Kenwood Blvd., Milwaukee, Wisconsin 53211
M. Ulla
Affiliation:
Laboratory for Surface Studies, University of Wisconsin-Milwaukee, 1900 E. Kenwood Blvd., Milwaukee, Wisconsin 53211
Zhilan Han
Affiliation:
Laboratory for Surface Studies, University of Wisconsin-Milwaukee, 1900 E. Kenwood Blvd., Milwaukee, Wisconsin 53211
M. Maclaurin
Affiliation:
Laboratory for Surface Studies, University of Wisconsin-Milwaukee, 1900 E. Kenwood Blvd., Milwaukee, Wisconsin 53211
B. P. Tonner
Affiliation:
Laboratory for Surface Studies, University of Wisconsin-Milwaukee, 1900 E. Kenwood Blvd., Milwaukee, Wisconsin 53211
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Abstract

Microscopy and x-ray emission analysis have been performed on Y–Ba–Cu–O superconductors as a function of temperature using a scanning electron microscope equipped with a low-temperature stage. The samples exhibit a superconducting phase transition above liquid nitrogen temperature as determined by resistivity measurements and a demonstrated Meissner effect. Strong contrast changes in the micrographs due to the superconducting phase transition are found, which have been used to identify normal and superconducting regions of the sample. These samples are found to consist of particles with superconducting shells surrounding a nonsuperconducting core.

Type
Materials Communications
Information
Journal of Materials Research , Volume 2 , Issue 5 , October 1987 , pp. 543 - 546
Copyright
Copyright © Materials Research Society 1987

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References

REFERENCES

1Wu, M. K., Ashburn, J. R., Torng, C. J., Hor, P. H., Meng, R. L., Gao, L., Huang, Z. J., Wang, Y. Q., and Chu, C. W., Phys. Rev. Lett. 58, 908 (1987); P. H. Hor, L. Gao, R. L. Meng, Z. J. Huang, Y. Q. Wang, K. Forster, J. Vassilious, C. W. Chu, M. K. Wu, J. R. Ashburn, and C. J. Torng, Phys. Rev. Lett. 58, 911 (1987).CrossRefGoogle Scholar
2Nguyen, N., Choisnet, J., Herview, M., and Raveau, B., J. Sol. State Chem. 39, 120 (1981).CrossRefGoogle Scholar
3Starting materials purchased from Cerac Corporation, Milwaukee, with the following purities: BaCO3 99. 0%, CuO 99. 9%, Y2O3 99. 9%. Internal sample serial number is YCBO-328-1-A.Google Scholar
4After the first calcining step the Y:Ba:Cu ratios are close to that of the initial unreacted material, and the reacted sample shows insulating behavior.Google Scholar
5Millman, W. S., Ulla, M., Timmer, W., Han, Zhilan, Xu, M. F., Baum, H. P., Schenstrom, A., Levy, M., Sarma, B., and Tonner, B. P., submitted to J. Chem. Phys.Google Scholar
6Engler, E. M., Lee, V. Y., Nazzal, A. I., Beyers, R. B., Lim, G., Grant, P. M., Parkin, S. S. P., Ramirez, M. L., Vazquez, J. E., and Savoy, R. J., submitted to J. Am. Chem. Soc.Google Scholar
7Ginley, D. S., Venturini, E. L., Kwak, J. F., Baughman, R. J., Morosin, B., and Schirber, J. E., Phys. Rev. B 36, 829 (1987).CrossRefGoogle Scholar