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Synthesis of [Ca2(Co1-xCux)2O4] yCoO2 Single Crystals and Their Intrinsic Properties

Published online by Cambridge University Press:  11 February 2011

M. Suzuki ,
S. Horii ,
M. Sano ,
K. Fujie ,
K. Otzschi ,
J. Shimoyama  and
K. Kishio
M. Suzuki
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
S. Horii
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
M. Sano
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
K. Fujie
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
K. Otzschi
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
J. Shimoyama
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan PRESTO/JST, Japan
K. Kishio
Affiliation:
Department of Superconductivity, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
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Abstract

Thin plate-like [Ca2(Co1-xCux)2O4] y CoO2 single crystals were successfully grown by the flux method using SrCl2 solvent. The largest crystal size was approximately 3 × 3 × 0.01 mm3. The copper concentrations, x, in the crystals were found to be depending on each crystal, suggesting a certain solid-solution range of copper in the present system. The obtained crystal showed low resistivity (∼4.3mQcm) and high Seebeck coefficient (∼160μVK-1) at 300K. The crystal showed anisotropic magnetization with larger magnetization under H ∥ c. Irreversible magnetization behavior below ∼90K was also found under H ∥ c.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 755: Symposium DD – Solid-State Chemistry of Inorganic Materials IV , 2002 , DD10.5
Copyright
Copyright © Materials Research Society 2003

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References

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