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Grain size dependence of microwave absorption in Y1Ba2Cu3O7 powders near Tc

โœ Scribed by A. Gould; E.M. Jackson; K. Renouard; R. Crittenden; S.M. Bhagat; N.D. Spencer; L.E. Dolhert; R.F. Wormsbecher

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
264 KB
Volume
156
Category
Article
ISSN
0921-4534

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โœฆ Synopsis

A systematic study of the relationship between particle dimensions and microwave absorption in micron size powders of superconducting Y~Ba2Cu307 reveals that small particles have negligible absorption at T< 0.8 To, and that the transition gets sharper as the grains get bigger. However, when the particles get so large as to incorporate multiple grains, the transition broadens and there is significant absorption down to 0.7 To. The temperature dependence in the small ( < 10 ~tm) powders is satisfactorily described by a simple extension of London's theory.

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