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Defects in Decomposed YBa2Cu4Ox(124) Superconductor after Rapid Annealing

MRS Online Proceedings Library volume 209, pages813–818(1990)Cite this article

Abstract

Decomposition of 124 into 123 has been studied after rapid annealing at temperatures from 800°C to 1000°C. It was found that the superconducting transition temperature (Tc) depended on the annealing temperature and atmosphere. For decomposed samples, 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.

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Acknowledgement

This work was supported by the National Science Foundation -Office of Science and Technology Centers under contract #STC-8809854 (YL, YG) and by the U. S. Department of Energy, Offices of Basic Energy Sciences - Materials Science, and Energy Storage and Distribution, Conservation and Renewable Energy, under contract #W-31-109-ENG-38 (KLM, HS, UB). The use of the H-9000 in the Dept. of Mater. Sci. & Eng., Northwestern University is gratefully acknowledged.

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Affiliations

  1. Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, IL, 60439

    Y. Li, Y. Gao, K. L. Merkle & H. Shi

  2. Materials and Components Technology Division, Argonne National Laboratory, Argonne, IL, 60439

    U. Balachandran

Authors
  1. Y. Li
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  2. Y. Gao
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  3. K. L. Merkle
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  4. H. Shi
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  5. U. Balachandran
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Correspondence to Y. Li.

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Li, Y., Gao, Y., Merkle, K.L. et al. Defects in Decomposed YBa2Cu4Ox(124) Superconductor after Rapid Annealing. MRS Online Proceedings Library 209, 813–818 (1990). https://doi.org/10.1557/PROC-209-813

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