Ferromagnetic Fluctuation and Possible Triplet Superconductivity in NaxCoO2·yH2O: Fluctuation-Exchange Study of the Multiorbital Hubbard Model
Masahito Mochizuki, Youichi Yanase, Masao Ogata
DOI 10.1103/PhysRevLett.94.147005 · Physical Review Letters
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Abstract
Spin and charge fluctuations and superconductivity in NaxCoO2·yH2O are studied based on a multiorbital Hubbard model. Tight-binding parameters are determined to reproduce the results of band calculations. By applying the fluctuation-exchange approximation, we show that the Hund’s-rule coupling between the Co t2g orbitals causes ferromagnetic (FM) spin fluctuation. Triplet fy(y2−3x2)-wave and p-wave pairings are favored by this FM fluctuation on the hole-pocket band. We propose that, in NaxCoO2·yH2O, the Co t2g orbitals and interorbital Hund’s-rule coupling play important roles on the triplet pairing, and this compound can be a first example of the triplet superconductor in which the orbital degrees of freedom play substantial roles.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCoO2·yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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