Abstract
Abstract Here, we propose that a close competition between spin singlet and spin-triplet pairings may be taking place in Na x CoO 2 · y H 2 O, which we model by an (extended) Hubbard Hamiltonian that takes into account the pocket-like Fermi surfaces and the van Hove singularity found in previous band calculation results. We show that spin-triplet f-wave pairing dominates when off-site repulsions are not too strong, while for larger values of off-site repulsions, spin-singlet i-wave pairing may take place.
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