Water Content and Superconductivity in Na0.3CoO2*yH2O

J. Cmaidalka; A. Baikalov; Y. Y. Xue; R. L. Meng; C. W. Chu

doi:10.1016/j.physc.2003.11.008

Water Content and Superconductivity in Na0.3CoO2*yH2O

Superconductivity 2009-11-10 v1

Authors: J. Cmaidalka , A. Baikalov , Y. Y. Xue , R. L. Meng , C. W. Chu

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Abstract

We report here the correlation between the water content and superconductivity in Na0.3CoO2*yH2O under the influences of elevated temperature and cold compression. The x-ray diffraction of the sample annealed at elevated temperatures indicates that intergrowths exist in the compound at equilibrium when 0.6 < y < 1.4. Its low-temperature diamagnetization varies linearly with y, but is insensitive to the intergrowth, indicative of quasi-2D superconductivity. The Tc-onset, especially, shifts only slightly with y. Our data from cold compressed samples, on the other hand, show that the water-loss non-proportionally suppresses the diamagnetization, which is suggestive of weak links.

Keywords

Na0.3CoO2*yH2O water content superconductivity intergrowth diamagnetization cold compression quasi-2D

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@article{arxiv.cond-mat/0308301,
  title  = {Water Content and Superconductivity in Na0.3CoO2*yH2O},
  author = {J. Cmaidalka and A. Baikalov and Y. Y. Xue and R. L. Meng and C. W. Chu},
  journal= {arXiv preprint arXiv:cond-mat/0308301},
  year   = {2009}
}

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10 pages, 10 figures; submitted to Physica C (August 13, 2003)

Water Content and Superconductivity in Na0.3CoO2*yH2O

Abstract

Keywords

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