Defects in Decomposed YBa2Cu4Ox(124) Superconductor after Rapid Annealing

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.

References

  1. 1.

    D. Dimos, P. Chaudhari, J. Mannhart, F. K. LeGoues, Phys. Rev. Lett. 61, 219–222 (1988).

    CAS  Article  Google Scholar 

  2. 2.

    D. Dimos, P. Chaudhari, J. Mannhart, Phys. Rev. B 41, 4038 (1990).

    CAS  Article  Google Scholar 

  3. 3.

    Y. Gao, K. L. Merkle, G. Bai, H. L. M. Chang, D. J. Lam, submitted to Physica C.

  4. 4.

    S. Jin, R. C. Sherwood, E. M. Gyorgy, T. H. Tiefel, R. B. van Dover, S. Nakahara, L.F. Schnelmeyer, R. A. Fastnacht, M. E. Davis, M. E., Appl. Phys. Lett. 54, 584 (1989).

    CAS  Article  Google Scholar 

  5. 5.

    R. K. Singh, J. Narayan, A. K. Singh, Krishnaswamy, Appl.Phys.Lett. 54, 2271 (1989).

    CAS  Article  Google Scholar 

  6. 6.

    K. Watanabe, Appl. Phys. Lett. 54, 575 (1989).

    CAS  Article  Google Scholar 

  7. 7.

    R. Ramesh, D. H. Hwang, T. Venkatesan, T. S. Ravi, A. Inam, X. D. Wu, B. Dutta, G. Thomas, A. F. Marshall, T. H. Geballe, Science 247, 57 (1990).

    CAS  Article  Google Scholar 

  8. 8.

    R. B. van Dover, E. M. Gyorgy, L. F. Schnelmeyer, J. W. Mitchell, K. V. Rao, R. Puzniak, J. V. Waszczak, Nature 342, 55 (1989).

    Article  Google Scholar 

  9. 9.

    S. Jin, T. H. Tiefel, S. Nakahara, J. E. Graebner, H. M. Os'Bryan, R. A. Fastnacht, G. W. Kammlott, Appl. Phys. Lett. 56, 1287–1289 (1990).

    CAS  Article  Google Scholar 

  10. 10.

    R. Ramesh, S. Jin, S. Nakahara, T. H. Tiefel, Appl. Phys. Lett. 57, 1458–1460 (1990).

    CAS  Article  Google Scholar 

  11. 11.

    U. Balachandran, M. E. Biznek, G. W. Tomlins, B. W. Veal, R. B. Poeppel, Physica C 165, 335 (1990).

    CAS  Article  Google Scholar 

  12. 12.

    S. L. Bud'ko, A. G. Gapotchenko, A. E. Luppov, Physica C 170, 259–266 (1990).

    CAS  Article  Google Scholar 

  13. 13.

    E. J. Kramers, J. Nucl. Mat. 72, 5 (1978).

    Article  Google Scholar 

  14. 14.

    G. P. van der Mey, and P. H. Kes, Phys. Rev. B 29, 6233 (1988).

    Google Scholar 

Download references

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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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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