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Ac Susceptibility Studies of the High Tc Superconductors: Dissipative Effects in La2.xSrxCuO4-Y and YBa2Cu3O7-Y Systems

Published online by Cambridge University Press:  28 February 2011

Xinsheng Ling ,
M. E. Filipkowski ,
E. K. Heller  and
J. I. Budnick
Xinsheng Ling
Affiliation:
Department of Physics & Institute of Materials Science, University of Connecticut, Storrs, CT 06269
M. E. Filipkowski
Affiliation:
Department of Physics & Institute of Materials Science, University of Connecticut, Storrs, CT 06269
E. K. Heller
Affiliation:
Department of Physics & Institute of Materials Science, University of Connecticut, Storrs, CT 06269
J. I. Budnick
Affiliation:
Department of Physics & Institute of Materials Science, University of Connecticut, Storrs, CT 06269
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Abstract

We have studied the variation of dissipative effects with doping in the high Tc superconductors La2-xSrxCuO4-y and YBa2Cu3O7-y by studying the lossy component of ac susceptibility as a function of temperature. We find relatively strong excess losses at low temperature in both systems, which indicate stronger flux creep at grain boundaries, in lower level doped ceramic samples produced by a similar process. This effect is more significant in the La2-xSrxCuO4-y (214) system than in the YBa2Cu3O7-y(123) system. We suggest that the microscopic mechanisms of weakening of the order parameter in the grain boundaries may be different in the two systems. In the 214 system, as the charge carrier density in the CuO2 planes is reduced, the spatial fluctuation of the order parameter in the CuO2 planes is enhanced. In the 123 system, the initial removal of O from the sample, which weakens the coupling between planes and increases the spatial fluctuation of the order parameter between CuO2 planes. The grain boundaries are degraded in both systems. The degradation in the 214 samples is more significant than in the 123 samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 947
Copyright
Copyright © Materials Research Society 1990

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