Water content and superconductivity in Na0.3CoO 2·yH2O

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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


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 may exist in the compound at equilibrium when 0.6<y<1.4. Its low-temperature equilibrium diamagnetization Ms 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.

Original languageEnglish
Pages (from-to)125-131
Number of pages7
JournalPhysica C: Superconductivity and its applications
Issue number3
Publication statusPublished - 2004 Apr 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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