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Defects in Decomposed Yba2Cu4Ox(124) Superconductor after Rapid Annealing

Published online by Cambridge University Press:  26 February 2011

Y. Li ,
Y. Gao ,
K. L. Merkle ,
H. Shi  and
U. Balachandran
Y. Li
Affiliation:
Materials Science Division and Science and Technology Center for Superconductivity
Y. Gao
Affiliation:
Materials Science Division and Science and Technology Center for Superconductivity
K. L. Merkle
Affiliation:
Materials Science Division and Science and Technology Center for Superconductivity
H. Shi
Affiliation:
Materials Science Division and Science and Technology Center for Superconductivity
U. Balachandran
Affiliation:
Materials and Components Technology Division Argonne National Laboratory, Argonne, IL 60439
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Abstract

Decomposition of 124 into 123 has been studied after rapid annealing at temperatures from 800°C to 1000°C. It was foundthat the superconducting transition temperature (Tc) depended on the annealing temperature and atmosphere. For decomposedsamples, fine-scale defects with strong strain contrast are observed in the 123 matrix. High-resolution electron microscopy studies show that the defects are parallel to the (001) planes of the 123 matrix. The length of the defects varies andranges from 5 nm to 50 nm in the direction parallel to the (001) planes. The defects have been interpreted to be copper oxides, which could be flux pinning centers in these materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 813
Copyright
Copyright © Materials Research Society 1991

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References

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