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Synthesis and Properties of Ultra-Thin YBa2Cu3O7 and YBa2Cu3O7/La2-xSrxCuO4 Multilayers

Published online by Cambridge University Press:  28 February 2011

C.B. Eom ,
S.K. Streiffer ,
J.Z. Sun ,
K. Yamamoto ,
S.S. Laderman ,
J.C. Bravman  and
T.H. Geballe
C.B. Eom
Affiliation:
Stanford University, Stanford, CA 94305
S.K. Streiffer
Affiliation:
Stanford University, Stanford, CA 94305
J.Z. Sun
Affiliation:
Stanford University, Stanford, CA 94305
K. Yamamoto
Affiliation:
Stanford University, Stanford, CA 94305
S.S. Laderman
Affiliation:
Hewlett-Packard Co., Palo Alto, CA94304
J.C. Bravman
Affiliation:
Stanford University, Stanford, CA 94305
T.H. Geballe
Affiliation:
Stanford University, Stanford, CA 94305
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Abstract

Using our standard single target off-axis sputter deposition procedure[1], ultra-thin YBa2Cu3O7 superconducting films were made in-situ. We have studied the thickness dependence of superconducting properties (Tc, Jc) from 20 to 5000Å. Tc starts degrading below 125Å and falls to 50 K for the 30 Å film. Jc drops linearly with decreasing thickness below l000Å. We have grown YBa2Cu3O7/La2-xSrxCuO4 superconducting thin film multilayers in-situ by the same process. The modulation wavelength of the multilayers ranged from 45Å to 2000Å. X-ray diffraction and cross sectional TEM confirm the superlattice periodicity. The superconducting transition temperature drops in much the same way as the single layer ultra-thin films. Both the critical current density and its magnetic field dependence decrease as the modulation wavelength decreases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 557
Copyright
Copyright © Materials Research Society 1990

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References

1 Eom, C.B. et al. , App. Phys. Lett., Vol.55, 595(1989)Google Scholar
2 Xi, X.X. et al. , AppL Phys. Lett., Vol .54, 2367(1989)Google Scholar
3 Streiffer, S.K., unpublishedGoogle Scholar
4 Eom, C.B. et al. unpublishedGoogle Scholar