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    National Tsing Hua University Institutional Repository > 理學院 > 物理系 > 期刊論文 >  Pairing symmetry and upward curvature of the upper critical field in superconducting Na0.35CoO2 center dot yH(2)O


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/54219


    Title: Pairing symmetry and upward curvature of the upper critical field in superconducting Na0.35CoO2 center dot yH(2)O
    Authors: Kao, Jun-Ting;Lin, Jiunn-Yuan;Mou, Chung-Yu
    教師: 牟中瑜
    Date: 2007
    Publisher: American Physical Society
    Relation: PHYSICAL REVIEW B, American Physical Society, Volume 75, Issue 1, JAN 2007
    Keywords: PURITY DEPENDENCE
    TEMPERATURE
    HC2
    YBA2CU3O7-DELTA
    HEAT
    Abstract: The origin for the upward curvature of the upper critical field (H-c2) observed in hydrate cobaltate Na0.35CoO2 center dot yH(2)O is investigated based on the microscopic gap equation. It is shown that the observed upward curvature results from the transition between two different pairing symmetries that occur on different energy bands. Furthermore, different pairing symmetries involved in the transition results in different upward curvatures. By considering transitions among all lowest possible pairing symmetries, it is found that the transition of the pairing symmetry from s-wave at low fields to d(x)(2)-y(2)+id(xy) at high fields is the best fit to the experimental data. Our results provide an important clue to the understanding of the superconductivity in hydrate cobaltate.
    URI: http://www.aps.org/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/54219
    Appears in Collections:[物理系] 期刊論文

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