標題: Pairing symmetry and upward curvature of the upper critical field in superconducting Na0.35CoO2 center dot yH(2)O
作者: Kao, Jun-Ting
Lin, Jiunn-Yuan
Mou, Chung-Yu
物理研究所
Institute of Physics
公開日期: 1-Jan-2007
摘要: 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://dx.doi.org/10.1103/PhysRevB.75.012503
http://hdl.handle.net/11536/11256
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.75.012503
期刊: PHYSICAL REVIEW B
Volume: 75
Issue: 1
起始頁: 0
結束頁: 0
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