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Synthesis and Low Temperature Physical Properties of Metal Substituted CoSr2YCu2Oy.

Published online by Cambridge University Press:  01 February 2011

Masahiro Shiraki ,
Jun-ichi Shimoyama ,
Shigeru Horii  and
Kohji Kishio
Masahiro Shiraki
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
Jun-ichi Shimoyama
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan PRESTO, Japan Science and Technology Corporation(JST), 4–1–8 Honcho, Kawaguchi, Saitama 332–0012, Japan
Shigeru Horii
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
Kohji Kishio
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
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Abstract

In the present study, hole carrier doping was attempted for CoSr2YCu2O7+δ which is a relating compound to a well known superconductor YBa2Cu3O7-δ by introduction of excess oxygen into CoO1+δ layer and cation substitutions. High valence metal substitution for cobalt and barium substitution for strontium were revealed to be able to introduce excess oxygen and generate hole carriers. Additional calcium substitution for yttrium enhanced hole carrier concentration p/Cu > 0.05 which was enough for superconductivity, however superconducting transition was not observed. This is possibly due to incorporation of cobalt in the CuO2 planes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF6.8
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

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