Pairing symmetry and upward curvature of the upper critical field in superconducting Na0.35 Co O2 •y H2 O

Jun Ting Kao*, Jiunn-Yuan Lin, Chung Yu Mou

*Corresponding author for this work

研究成果: Article同行評審

9 引文 斯高帕斯(Scopus)

摘要

The origin for the upward curvature of the upper critical field (Hc2) observed in hydrate cobaltate Na0.35 Co O2 •y H2 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 x2 - y2 +i dxy 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.

原文English
文章編號012503
期刊Physical Review B - Condensed Matter and Materials Physics
75
發行號1
DOIs
出版狀態Published - 29 一月 2007

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