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28 March 2024 |
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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 | Affiliation: | 1, 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 | 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. | Source: | arXiv, cond-mat/0308301 | Services: | Forum | Review | PDF | Favorites |
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