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Orientation Dependence of Flux Pinning in a Layered Bi2Sr2 Ca1 Cu2O8 + 10% Ag Composite

Published online by Cambridge University Press:  28 February 2011

Maria Foldeaki  and
Hassel Ledbetter
Maria Foldeaki
Affiliation:
National Institute of Standards and Technology, Boulder, Colorado 80303
Hassel Ledbetter
Affiliation:
National Institute of Standards and Technology, Boulder, Colorado 80303
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Abstract

The Bi2 Sr2 Ca1 Cu2 O8 + 10% Ag specimen was grain oriented along the a(b) axis, but random in the perpendicular plane. Magnetic susceptibility and hysteresis measured along the axis of grain orientation and in the polycrystalline direction showed remarkable anisotropy. At low temperatures (below about 30 K), hysteresis curves were compatible with the strong-pinning model. The pinning force calculated from the hysteresis loop showed a higher maximum in the random direction, but decreased fast with increasing field and temperature. From the zero-field-cooled (zfc) and field-cooled (fc) susceptibility curves, the irreversibility line T*(H*) was determined. Evaluation according to the de Almeida-Thouless equation with fixed exponent n=3/2 revealed a two-phase vortex structure; one nearly isotropic with low (40-$K) zero-field irreversibility transition temperature, and one strongly anisotropic, the irreversibility transition being close to the superconducting-transition temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 235: Symposium A – Phase Formation and Modification by Beam-Solid Interactions , 1991 , 701
Copyright
Copyright © Materials Research Society 1992

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References

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