Abstract
In order to investigate the pairing mechanism of possible spin-triplet superconductors (TMTSF) 2X and Sr 2RuO 4, we study the competition among various spin singlet and triplet pairing channels in the Hubbard model by calculating the pairing interaction vertex using the ground state quantum Monte Carlo technique. We model (TMTSF) 2X by a quarter-filled quasi-one-dimensional (quasi-1D) Hubbard model, and the γ band of Sr 2RuO 4 by a two-dimensional (2D) Hubbard model with a band filling of ∼4/3. For the quasi-1D system, we find that triplet f-wave pairing not only dominates over triplet p-wave in agreement with the spin-charge fluctuation theory, but also looks unexpectedly competitive against d-wave. For the 2D system, the d-wave pairing interaction is found to be larger than those of the triplet channels.
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