Pairing Symmetry and Upward Curvature of Upper Critical Field in Superconducting $Na_{0.35} Co O_2 \cdot y H_2 O$

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dc.creatorKao, Jun-Ting
dc.creatorLin, Jiunn-Yuan
dc.creatorMou, Chung-Yu
dc.date2007-01-08
dc.date.accessioned2026-07-07T07:39:01Z
dc.date.available2026-07-07T07:39:01Z
dc.descriptionThe origin for the upward curvature of the upper critical field ($H_{c2}$) observed in hydrate cobaltate Na$_{0.35}$CoO$_{2} \cdot y$H$_{2}$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.
dc.description4 pages, 1 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0701135
dc.identifierhttp://arxiv.org/abs/cond-mat/0701135
dc.identifierPhys. Rev. B 75, 012503 (2007)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/121302
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titlePairing Symmetry and Upward Curvature of Upper Critical Field in Superconducting $Na_{0.35} Co O_2 \cdot y H_2 O$
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