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RHEED-Controlled Unit-Cell by Unit-Cell Layer-Growth of High-Tc Cuprate Films with Laser-Ablation Technique

Published online by Cambridge University Press:  26 February 2011

T. Frey ,
C. C. Chi ,
C. C. Tsuei ,
T. Shaw  and
G. Trafas
T. Frey
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York
C. C. Chi
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York
C. C. Tsuei
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York
T. Shaw
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York
G. Trafas
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York
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Abstract

Thin films of PrBa2Cu3O7 and in-situ superconducting YBa2Cu3O7 were grown on (100)-oriented SrTiO3 substrates by laser ablation under molecular beam epitaxial condition. The unit-cell by unit-cell growth of these high-Tc cuprate materials has been indicated by RHEED-oscillations and further confirmed by cross-sectional TEM (X-TEM) and small angle X-ray. Superconductivity with Tc (R = 0) at 35 K was observed for samples with one unit-cell YBa2Cu3O7 layers sandwiched between PrBa2Cu3O7 layers. TC varies with the number of YBa2Cu3O7 unit-cell layers. An eight unit-cell thick YBa2Cu3O7 film is superconducting at 86 K. Substrate temperature is found to be the most crucial parameter in determining the growth mode and superconducting properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 61
Copyright
Copyright © Materials Research Society 1992

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