To reveal the origin of the "nematic electronic fluid phase" in Sr3Ru2O7, we apply the self-consistent vertex correction analysis to the (dxz, dyz)-orbital Hubbard model. It is found that the Aslamazov-Larkin type vertex correction causes the strong coupling between spin and orbital fluctuations, which corresponds to the Kugel-Khomskii spin-orbital coupling in the local picture. Owing to this mechanism, orbital nematic order with C2 symmetry is induced by the magnetic quantum criticality in multiorbital systems, whereas this mechanism is ignored in the random-phaseapproximation (RPA). This study provides a natural explanation for the close relationship between the magnetic quantum criticality and nematic state in Sr3Ru2O7 and Fe-based superconductors.
- Orbital nematic order
- Quantum criticality
- Vertex correction
ASJC Scopus subject areas
- General Physics and Astronomy