Strong electron-phonon coupling driven pseudogap modulation and density-wave fluctuations in a correlated polar metal.

ABSTRACT: There is tremendous interest in employing collective excitations of the lattice, spin, charge, and orbitals to tune strongly correlated electronic phenomena. We report such an effect in a ruthenate, Ca₃Ru₂O₇, where two phonons with strong electron-phonon coupling modulate the electronic pseudogap as well as mediate charge and spin density wave fluctuations. Combining temperature-dependent Raman spectroscopy with density functional theory reveals two phonons, B₂^P and B₂^M, that are strongly coupled to electrons and whose scattering intensities respectively dominate in the pseudogap versus the metallic phases. The B₂^P squeezes the octahedra along the out of plane c-axis, while the B₂<

SUBMITTER: Wang HH 

PROVIDER: S-EPMC10507017 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature