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Superconducting Properties of Ultrathin YBa2CU3O7 Films

Published online by Cambridge University Press:  26 February 2011

T. Terashima ,
K. Shimura ,
Y. Daitoh ,
Y. Yano ,
Y. Bando ,
Y. Matsuda  and
S. Komiyama
T. Terashima
Affiliation:
Institute for Chemical Research, Kyoto University, Uji 611, Japan
K. Shimura
Affiliation:
Institute for Chemical Research, Kyoto University, Uji 611, Japan
Y. Daitoh
Affiliation:
Institute for Chemical Research, Kyoto University, Uji 611, Japan
Y. Yano
Affiliation:
Institute for Chemical Research, Kyoto University, Uji 611, Japan
Y. Bando
Affiliation:
Institute for Chemical Research, Kyoto University, Uji 611, Japan
Y. Matsuda
Affiliation:
Department of Pure and Applied Sciences, University of Tokyo, 3–8–1 Komaba, Meguro-ku, Tokyo 153, Japan
S. Komiyama
Affiliation:
Department of Pure and Applied Sciences, University of Tokyo, 3–8–1 Komaba, Meguro-ku, Tokyo 153, Japan
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Abstract

Ultrathin YBa2CU3O7 (YBCO) films were epitaxially grown on non-superconducting PrBa2CU3O7 (PrBCO) buffer layer by reactive evaporation, in which the crystal growth was controlled through the monitoring of reflection high energy electron diffraction (RHEED) specular intensity oscillations. Atomic force microscope (AFM) observation reveals that the steps in the surface of ultrathin YBCO films (∼100Aå) have one-unit-cell height, implying a unit cell-by-unit cell growth manner. One-unit-cell thick (1-UCT) YBCO layer exhibits superconductivity when charge reservoir layers of BaO-CuO-BaO are located above and below the CuO2 bilayer interposed with an Y layer. Essential transport properties of the normal state in bulk YBCO, such as T-linear dependence of resistivity and T-1 dependence Of Hall resistivity, are found to be inherent in the individual CuO2 bilayer. Study of diagonal and Hall resistivities provides evidence of Kosterlitz-Thouless transition to be occurred in 1-UCT YBCO.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 49
Copyright
Copyright © Materials Research Society 1992

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References

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