The d-vector in possible spin triplet superconductor Nax CoO2 · y H2 O is microscopically analyzed on the basis of the multi-orbital Hubbard model including the atomic spin-orbit coupling. As a result of the perturbation theory, it is shown that the d-vector is parallel to the plane when the pairing symmetry is p-wave, while both over(d, ^) ∥ xy and over(d, ^) ∥ z are possible in the f-wave state. We point out that the multiple phase transitions are expected under the in-plane magnetic field when the pairing symmetry is p-wave.
- Multiple phase diagram
- Na CoO · y H O
- Spin-orbit coupling
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering