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| Home > Publications database > Spin and charge excitations in the correlated multiband metal $Ca_{3}Ru_{2}O_{7}$ |
| Journal Article | PUBDB-2021-00998 |
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2021
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevB.103.085108 doi:10.3204/PUBDB-2021-00998
Abstract: We use Ru L$_3$-edge resonant inelastic x-ray scattering to study the full range of excitations in Ca$_3$Ru$_2$O$_7$ from meV-scale magnetic dynamics through to the eV-scale interband transitions. This bilayer 4d-electron correlated metal expresses a rich phase diagram, displaying long-range magnetic order below 56 K followed by a concomitant structural, magnetic, and electronic transition at 48 K. In the low-temperature phase, we observe a magnetic excitation with a bandwidth of ∼30 meV and a gap of ∼8 meV at the zone center, in excellent agreement with inelastic neutron scattering data. The dispersion can be modeled using a Heisenberg Hamiltonian for a bilayer S=1 system with single-ion anisotropy terms. At a higher energy loss, dd-type excitations show heavy damping in the presence of itinerant electrons, giving rise to a fluorescencelike signal appearing between the t$_{2g}$ and e$_g$ bands. At the same time, we observe a resonance originating from localized t$_{2g}$ excitations, in analogy to the structurally related Mott insulator Ca$_2$RuO$_4$. But whereas Ca$_2$RuO$_4$ shows sharp separate spin-orbit excitations and Hund's-rule driven spin-state transitions, here we identify only a single broad asymmetric feature. These results indicate that local intraionic interactions underlie the correlated physics in Ca$_3$Ru$_2$O$_7$, even as the excitations become strongly mixed in the presence of itinerant electrons.
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