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Single Buffer Layer Technology for YBCO Coated Conductors

Published online by Cambridge University Press:  18 March 2011

M. Parans Paranthaman
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6100, USA
T. Aytug
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6100, USA
H. Y. Zhai
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6100, USA
S. Sathyamurthy
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6100, USA
H. M. Christen
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6100, USA
P. M. Martin
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6100, USA
D. K. Christen
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6100, USA
R. E. Erickson
Affiliation:
3M Company, St. Paul, MN 55144, USA
C. L. Thomas
Affiliation:
3M Company, St. Paul, MN 55144, USA
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Abstract

In an effort to develop alternative single buffer layer technology for YBa2Cu3O7-δ (YBCO) coated conductors, we have investigated LaMnO3 (LMO) as a potential buffer layer. High-quality LMO films were grown directly on biaxially textured Ni and Ni-W (3%) substrates using rf magnetron sputtering. YBCO films were then grown on LMO buffers using pulsed laser deposition. Detailed X-ray studies have shown that both YBCO and LMO layers were grown with a single epitaxial orientation. Rutherford backscattering spectroscopy (RBS) analyses have indicated the ratio of La to Mn ratio is 1:1. SEM micrographs indicated that 3000-Å-thick LMO films on biaxially textured Ni (100) substrates were dense, continuous and crack-free. A high Jc of over 1 MA/cm2 at 77 K and self-field was obtained on YBCO films grown on LMO-buffered Ni or Ni-W substrates. We have identified LaMnO3 as a good diffusion barrier layer for Ni and it also provides a good template for growing high current density YBCO films.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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References

1. Paranthaman, M. Parans, Aytug, T., Sathyamurthy, S., Beach, D.B., Goyal, A., Lee, D.F., Kang, B.W., Heatherly, L., Specht, E.D., Leonard, K.J., Christen, D.K., and Kroeger, D.M., Physica C (in press) (2002).Google Scholar
2. Aytug, T., Paranthaman, M., Kang, B.W., Sathyamurthy, S., Goyal, A., and Christen, D.K., Appl. Phys. Lett. 79, 2205 (2001).CrossRefGoogle Scholar

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