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Local magnetic field distribution in polycrystalline YBa2Cu3O7 and its influence on bulk critical currents

Published online by Cambridge University Press:  31 January 2011

Thomas R. Askew
Affiliation:
Central Research and Development Department, E.I. Du Pont de Nemours and Co., P.O. Box 80357, Wilmington, Delaware 19880–0357
Richard B. Flippen
Affiliation:
Central Research and Development Department, E.I. Du Pont de Nemours and Co., P.O. Box 80357, Wilmington, Delaware 19880–0357
Kevin J. Leary
Affiliation:
Jackson Laboratory, E. I. Du Pont de Nemours and Co., Deepwater, New Jersey 08023
Milind N. Kunchur
Affiliation:
Department of Physics, University of Virginia, Charlottesville, Virginia 22901
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Abstract

The transport critical current density Jc has been measured in high quality polycrystalline YBa2Cu3O7 samples made from extruded preforms. The hysteretic response of Jc to applied magnetic fields was studied as a function of temperature (77–87 K) and sample morphology for various field sweeps in the 0–5 KOe range. A variety of samples show a basic JcHn behavior where n depends on temperature, but is independent of the other variables. A simple model of the local magnetic field distribution is presented and compared to the data, and the theoretical implications of the power law behavior are considered.

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Articles
Copyright
Copyright © Materials Research Society 1991

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