Triplet superconductivity in a model of Li${}_{0.9}$Mo${}_6$O${}_{17}$

Abstract

Superconductivity in the quasi-one-dimensional material Li${}_{0.9}$Mo${}_6$O${}_{17}$ is analyzed based on a multiorbital extended Hubbard model. We found strong charge fluctuations at two different momenta ${\mathbf{Q}}_1$ and ${\mathbf{Q}}_2$ giving rise to two different charge ordered phases. Evaluating the superconducting vertex, we found superconductivity near strong charge fluctuations at ${\mathbf{Q}}_1$. The order parameter has the p-wave symmetry with nodes on the Fermi surface. The metallic state displays a characteristic charge collective mode ${\mathbf{Q}}_1$ due to nesting and for on-site Hubbard repulsion sufficiently large, a charge critical mode ${\mathbf{Q}}_2$ 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.

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Cited by in corpus (3)

• Spin-orbit coupling and odd-parity superconductivity in the quasi-one-dimensional compound Li${}_{0.9}$Mo${}_6$O${}_{17}$
• Wannier-Orbital theory and ARPES for the quasi-1D conductor LiMo${}_6$O${}_{17}$
• Possible Existence of Superconductivity in the Quasi-One-Dimensional Conductor Li${}_{0.9}$Mo${}_6$O${}_{17}$ at Ultrahigh Magnetic Fields, $H\ge 45T$