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Transport Measurements on Superconducting YBa2Cu3O7-δ Thin Film Lines

Published online by Cambridge University Press:  28 February 2011

B. H. Moeckly ,
D. K. Lathrop ,
G. F. Redinbo ,
S. E. Russek  and
R. A. Buhrman
B. H. Moeckly
Affiliation:
School of Applied and Engineering Physics, Cornell University, Ithaca NY, 14853–2501
D. K. Lathrop
Affiliation:
School of Applied and Engineering Physics, Cornell University, Ithaca NY, 14853–2501
G. F. Redinbo
Affiliation:
School of Applied and Engineering Physics, Cornell University, Ithaca NY, 14853–2501
S. E. Russek
Affiliation:
School of Applied and Engineering Physics, Cornell University, Ithaca NY, 14853–2501
R. A. Buhrman
Affiliation:
School of Applied and Engineering Physics, Cornell University, Ithaca NY, 14853–2501
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Abstract

Critical current densities, magnetic field response, and microwave response have been measured for laser ablated YBa2Cu3O7-δ thin film lines on MgO and SrTiO3 substrates. Films on SrTiO3 have critical current densities > 1 x 106 A/cm2 at 77K and show uniform transport properties in lines of all sizes. Films on MgO have critical current densities which range between 102 and 106 A/cm2 at 77K and show considerable variation from device to device on the same chip. Narrow lines on MgO with low critical current densities show Josephson weak link structure which includes RSJ-like IV curves, microwave induced constant voltage steps, and a high sensitivity to magnetic field. The presence of the Josephson weak links is correlated with small amounts of misaligned grains in films on MgO.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 1193
Copyright
Copyright © Materials Research Society 1990

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References

1 Dimos, D., Chaudhari, P., and Mannhart, J., submitted to Phys. Rev. B.Google Scholar
2 Russek, S. E., Moeckly, B. H., Buhrman, R.A., McWhirter, J. T., Sievers, A. J., Norton, M. G., Tietz, L. A. and Carter, B., Proceedings of MRS Fall Meeting, Boston, MA>, 1989 ,+1989>Google Scholar
3 Shin, D. H., Silcox, J., Russek, S. E., Lathrop, D. K., Moeckly, B. H., and Buhrman, R.A., in press.Google Scholar