Multi-orbital nature of the spin fluctuations in Sr${}_2$RuO${}_4$

Abstract

The spin susceptibility of strongly correlated Sr${}_2$RuO${}_4$ is known to display a rich structure in reciprocal space, with a prominent peak at ${\mathbf{Q}}_i$=$(0.3,0.3,0)$. It is still debated if the resulting incommensurate spin-density-wave fluctuations foster unconventional superconductivity at low temperature or compete therewith. By means of density functional theory combined with dynamical mean-field theory, we reveal the realistic multi-orbital signature of the (dynamic) spin susceptibility beyond existing weak-coupling approaches. The experimental fluctuation spectrum up to 80 meV is confirmed by theory. Furthermore, the peak at ${\mathbf{Q}}_i$ is shown to carry nearly equal contributions from each of the Ru$(4d)$-$t_{2g}$ orbitals, pointing to a cooperative effect resulting in the dominant spin fluctuations.

5 pages, 4 figures