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Microstructure and microwave properties of YBCO thin films grown on MgO and SrTiO3 by CVD

Published online by Cambridge University Press:  31 January 2011

K.H. Young ,
McD. Robinson ,
G.V. Negrete ,
T. Yamashita ,
T. Hirai ,
H. Suzuki ,
H. Kurosawa ,
L. Drabeck  and
G. Grüner
K.H. Young
Affiliation:
Superconductor Technologies Inc., 460-F Ward Drive, Santa Barbara, California 93111
McD. Robinson
Affiliation:
Superconductor Technologies Inc., 460-F Ward Drive, Santa Barbara, California 93111
G.V. Negrete
Affiliation:
Superconductor Technologies Inc., 460-F Ward Drive, Santa Barbara, California 93111
T. Yamashita
Affiliation:
Department of Electronics, Nagaoka University of Technology, Nagaoka, Niigata 940–21, Japan
T. Hirai
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, Miyagi 980, Japan
H. Suzuki
Affiliation:
Technological Research Center, Riken Corporation, Kumagaya 810, Saitama 360, Japan
H. Kurosawa
Affiliation:
Technological Research Center, Riken Corporation, Kumagaya 810, Saitama 360, Japan
L. Drabeck
Affiliation:
Department of Physics, University of California–Los Angeles, Los Angeles, California 90024
G. Grüner
Affiliation:
Department of Physics, University of California–Los Angeles, Los Angeles, California 90024
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Abstract

The microstructure and microwave properties of YBa2Cu3O7−δ thin films grown on SrTiO3 (100) and MgO (100) substrates by chemical vapor deposition have been studied. Both 100 GHz cavity measurement of surface resistance and ground plane substitution in a 5 GHz microstrip resonator show that films on SrTiO3 have better microwave properties than those on MgO. Although there are some a-axis grains and secondary phases on the surface, a large fraction of each film on SrTiO3 is epitaxial with its c axis normal to the substrate. The 100 GHz surface resistance of these films is less than copper for temperature ⋚ 82 K, and approaches the detection limit at 10–20 K. For the films on MgO, c-axis grains of different in-plane rotation are found together with some a-axis needle-like grains. The grain boundaries are detrimental to the microwave properties, and the resulting surface resistance at 100 GHz and 10–20 K is about 20 mΩ higher than that of films on SrTiO3.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 11 , November 1991 , pp. 2259 - 2263
Copyright
Copyright © Materials Research Society 1991

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