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    National Tsing Hua University Institutional Repository > 理學院 > 物理系 > 會議論文  >  Effects of disorder on the upper critical field in superconducting Na0.35CoO2yH2O

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/56060

    Title: Effects of disorder on the upper critical field in superconducting Na0.35CoO2yH2O
    Authors: Jun-Ting Kao;Jiunn-Yuan Lin;Chung-Yu Mou
    教師: 牟中瑜
    Date: 2009
    Publisher: Institute of Physics
    Relation: 25th International Conference on Low Temperature Physics (LT25), Amsterdam, Netherlands, 6-13 Aug. 2008, Pages 052174(4 pp.)
    Keywords: band structure
    sodium compounds
    superconducting materials
    upper critical field
    Abstract: The curvature of upper critical field (Hc2) for two-band superconductors is investigated based on the microscopic gap equation. By including effects of nonmagnetic impurity, it is shown that the observed upward curvature in hydrate cobaltate Na0.35CoO2midyH2O can be quantitatively reproduced by assuming a transition of the pairing symmetry from s-wave at low fields to dx2-y2 + idxy at high fields. Our results indicate that two different pairing symmetries must occur on different energy bands to account for the upward curvature. Furthermore, disorders are responsible for the suppression of upward curvature observed at low temperatures in experiments. These results provide important clues to understand superconductivity occurring in hydrate cobaltate.
    URI: http://www.iop.org/
    Appears in Collections:[物理系] 會議論文

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