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The Systematics of Irreversibility in Superconducting Thallium Cuprates

Published online by Cambridge University Press:  26 February 2011

J. L. Tallon ,
M. R. Presland ,
R. G. Buckley  and
A. Mawdsley
J. L. Tallon
Affiliation:
DSIR Physical Sciences, P. O. Box 31313, Lower Hutt, New Zealand.
M. R. Presland
Affiliation:
DSIR Physical Sciences, P. O. Box 31313, Lower Hutt, New Zealand.
R. G. Buckley
Affiliation:
DSIR Physical Sciences, P. O. Box 31313, Lower Hutt, New Zealand.
A. Mawdsley
Affiliation:
DSIR Physical Sciences, P. O. Box 31313, Lower Hutt, New Zealand.
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Abstract

The irreversibility lines, Hirr(T), for the series of superconducting compoundsTlmA2CunO2+m+2n, where A is Ba or Sr, are measured between 0 and 1 tesla for m = 1,2 and n = 1,2,3 and 4 and show a marked steepening with decreasing anisotropy i.e. as m is lowered from 2 to 1. In addition, for m=2 material Hlrr(T) is observed to steepen with decreasing number of CuO2 layers. The hole dependence of the irreversibility line is also investigated in TI2Ba2CuO6+6 by changing the oxygen stoichiometry, 6. Hirr(T) progressively steepens with increasing hole concentration on the overdoped sida of Tc(max). These results are consistent with a model of flux motion arising from a crossover from 3-D vortex lines to 2-D pancake vortices which are decoupled in the c-direction, and provide guidance for materials selection and optimum doping.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 913
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

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