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Specific Heat Study of Ba2YCu3Oy (6 < y < 7) and Ba2Y(Cu1-xMx)3Oy (M = Zn, Ni, and Al)

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The Physics and Chemistry of Oxide Superconductors

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 60))

Abstract

We performed a systematic study of the effects of oxygen stoichiometry and Zn, Ni and Al doping on specific heat of Ba2YCu3Oy system. The results of low temperature specific heat experiments suggest that the finite T linear (γ*) term remaining in the superconducting state and the upturn of Cp/T at the lowest temperatures are related to disorder in the CuO2 plane and the CuO chain, respectively. A double peak structure observed in a fully oxidized y=6.92 sample was found to be extremely sensitive to the oxygen depletion or chain doping. Samples of y=6.88~6.90 or M=Al x=0.5 at.% substituted sample revealed a distinct single peak of mean field type with ΔCp/Tc as large as 50~60mJ/(mol·K2).

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Author information

Authors and Affiliations

  1. Institute for Solid State Physics, University of Tokyo, 7-22-1, Roppongi, Minato-ku, Tokyo 106, Japan

    Y. Nakazawa, J. Takeya & M. Ishikawa

Authors
  1. Y. Nakazawa
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  2. J. Takeya
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  3. M. Ishikawa
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Editor information

Editors and Affiliations

  1. Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan

    Yasuhiro Iye  & Hiroshi Yasuoka  & 

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© 1992 Springer-Verlag Berlin, Heidelberg

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Nakazawa, Y., Takeya, J., Ishikawa, M. (1992). Specific Heat Study of Ba2YCu3Oy (6 < y < 7) and Ba2Y(Cu1-xMx)3Oy (M = Zn, Ni, and Al). In: Iye, Y., Yasuoka, H. (eds) The Physics and Chemistry of Oxide Superconductors. Springer Proceedings in Physics, vol 60. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77154-5_57

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  • DOI: https://doi.org/10.1007/978-3-642-77154-5_57

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-77156-9

  • Online ISBN: 978-3-642-77154-5

  • eBook Packages: Springer Book Archive

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