2005/07/13 by Youichi Yanase, Masahito Mochizuki, Masao Ogata
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Coupling (piping) #Degeneracy (biology) #Degenerate energy levels #Ground state #Magnetic and transport properties of perovskites and related materials #Materials science #Pairing #Perturbation theory (quantum mechanics) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Spin–orbit interaction #Superconductivity #Wave function #Wave vector #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.74.2568
To appear in J. Phys. Soc. Jpn. 74 (2005) No.9
arxiv created 2005/07/13 · openalex publication_date 2005/09/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The d-vector in possibile spin triplet superconductor NaxCoO2yH2O is microscopically investigated on the basis of the multi-orbital Hubbard model including the atomic spin-orbit coupling. As a result of the perturbation theory, we obtain the stable spin triplet superconductivity where the p-wave and f-wave states can be stabilized. If we neglect the spin-orbit coupling, superconducting state has 6-fold (3-fold) degeneracy in the p-wave (f-wave) state. This degeneracy is lifted by the spin-orbit coupling. We determine the d-vector within the linearlized Dyson-Gorkov equation. It is shown that the d-vector is always along the plane when the pairing symmetry is p-wave, while it depends on the parameters in case of the f-wave state. The lifting of degeneracy is significant in the p-wave state while it is very small in the f-wave state. This is because the first order term with respect to the spin-orbit coupling is effective in the former case, while it is ineffective in the latter case. The consistency of these results with NMR and \muSR measurements are discussed.