Pairing symmetry and upward curvature of the upper critical field in superconducting Na0.35CoO2∙yH2O
Jun-Ting Kao, Jiunn-Yuan Lin, Chung-Yu Mou
DOI 10.1103/PhysRevB.75.012503 · Physical Review B
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Abstract
The origin for the upward curvature of the upper critical field (Hc2) observed in hydrate cobaltate Na0.35CoO2∙yH2O 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 dx2−y2+idxy 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.35CoO2*yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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