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Preparation and Transition Temperature of Ca‐Substituted Yba2Cu4O8

Published online by Cambridge University Press:  28 February 2011

T. Miyatake ,
K. Yamaguchi ,
T. Takata ,
S. Gotoh ,
N. Koshizuka  and
S. Tanaka
T. Miyatake
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, Shinonome, Koto‐ku, Tokyo 135, Japan
K. Yamaguchi
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, Shinonome, Koto‐ku, Tokyo 135, Japan
T. Takata
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, Shinonome, Koto‐ku, Tokyo 135, Japan
S. Gotoh
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, Shinonome, Koto‐ku, Tokyo 135, Japan
N. Koshizuka
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, Shinonome, Koto‐ku, Tokyo 135, Japan
S. Tanaka
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, Shinonome, Koto‐ku, Tokyo 135, Japan
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Abstract

Samples of Y1‐xCaxBa2Cu4O8 are prepared by means of a new high pressure technique employing the oxygen‐HIP. We find that the transition temperature increases with Ca content, and that Tc=90K is realized at x=0.1. These data are explained by the hole concentration, i.e. average charge per [Cu‐O] site. KEY‐WORDS: YBa2Cu4O8, Ca‐substitution, Transition temperature, Hole concentration

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 241
Copyright
Copyright © Materials Research Society 1990

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References

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