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A comparison of the modulated microwave absorption spectra of ceramic and powdered YBa2Cu3O7-δ samples

Published online by Cambridge University Press:  31 January 2011

R. S. Rubins ,
Stuart L. Hutton ,
John E. Drumheller ,
D. Y. Jeong  and
T. D. Black
R. S. Rubins
Affiliation:
Department of Physics, Montana State University, Bozeman, Montana 59717
Stuart L. Hutton
Affiliation:
Department of Physics, Montana State University, Bozeman, Montana 59717
John E. Drumheller
Affiliation:
Department of Physics, Montana State University, Bozeman, Montana 59717
D. Y. Jeong
Affiliation:
Department of Physics, Box 19059, University of Texas at Arlington, Arlington, Texas 76019
T. D. Black
Affiliation:
Department of Physics, Box 19059, University of Texas at Arlington, Arlington, Texas 76019
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Abstract

Flux trapping in the 9.3 GHz modulated microwave absorption spectra observed near 4 K from ceramic and powdered ceramic specimens of two separately prepared YBa2Cu3O7-δ samples has been used to separate the intergranular and intragranular contributions to the spectra. In the denser, glassy sample, a broad absorption with a peak near 400 Oe for forward sweeps was observed with appreciable intensity after the maximum flux was trapped. This spectrum is attributed to intergranular junctions, since its relative intensity was reduced on powdering and suspending in wax. In the less dense, more uniform sample, the latter spectrum was appreciably weaker in both ceramic and powder. Both types of junction appear to contribute to the narrow low-field absorption which was observed after zero field cooling in all the samples.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 9 , September 1990 , pp. 1813 - 1818
Copyright
Copyright © Materials Research Society 1990

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