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Frequency Dependence of the Absorption Component of the Magnetic Susceptibility in Superconducting Y1Ba2Cu3O7

Published online by Cambridge University Press:  28 February 2011

S. Ducharme ,
R. Durny ,
J. Hautala ,
O. G. Symko ,
P. C. Taylor  and
Sudhir Kulkarni
S. Ducharme
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
R. Durny
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
J. Hautala
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
O. G. Symko
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
P. C. Taylor
Affiliation:
Department of Physics, University of Utah, Salt Lake City, UT 84112
Sudhir Kulkarni
Affiliation:
Ceramatec, Inc., 4225 S. 900 W., Salt Lake City, UT 84119
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Abstract

We report measurements of an apparent magnetic-field-dependent absorption (imaginary part of the a.c. magnetic susceptibility) in superconducting Y1Ba2Cu3O7 ceramics and crystals. The absorption, which is observed over a wide range of frequencies but only when the material is below the superconducting transition temperature, is characterized by a narrow (∼ 30 Gauss FWHM at 6 MHz) peak and a wide (> 10 kG) feature, both of which are maximum at zero magnetic field. The absorption strength varies approximately as one over the square root of the frequency. The unusual magnetic-field-dependent peaks in the magnetic susceptibility are inherent in single grains and therefore do not originate from intergrain Josephson currents or multigrain (i.e., percolative) loops. The susceptibility peaks must be due to bulk behavior, interactons at grain surfaces, intragrain current loops, or intra-grain Josephson Junctions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 845
Copyright
Copyright © Materials Research Society 1988

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References

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