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28 March 2024
 
  » arxiv » cond-mat/0308301

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Water Content and Superconductivity in Na0.3CoO2*yH2O
J. Cmaidalka ; A. Baikalov ; Y. Y. Xue ; R. L. Meng ; C. W. Chu ;
Date 15 Aug 2003
Subject Superconductivity | cond-mat.supr-con
Affiliation1, 2), Y. Y. Xue (1, 2), R. L. Meng (1, 2), C. W. Chu (1, 2, 3, 4) ( TCSAM, University of Houston, Dept. of Physics, University of Houston, LBNL, HKUST
AbstractWe 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.
Source arXiv, cond-mat/0308301
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