Triplet superconductivity in a model of Li0.9Mo6O17.

Superconductivity in the quasi-one-dimensional material Li0.9Mo6O17 is analyzed based on a multiorbital extended Hubbard model. We found strong charge fluctuations at two different momenta Q1 and Q2 giving rise to two different charge-ordered phases. Evaluating the superconducting vertex, we found superconductivity near strong charge fluctuations at Q1. The order parameter has p-wave symmetry with nodes on the Fermi surface. The metallic state displays a characteristic charge collective mode Q1 due to nesting and, for on-site Hubbard repulsion sufficiently large, a charge critical mode Q2 driven by Coulomb repulsion, which softens at the proximity to the transition. The results are quite robust for different coupling parametrizations. A phase diagram discussing the relevance of the model to the physics of the material is proposed. [ABSTRACT FROM AUTHOR]