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| 001 | 455234 | ||
| 005 | 20250716150646.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevB.103.085108 |2 doi |
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| 100 | 1 | _ | |a Bertinshaw, J. |0 P:(DE-H253)PIP1027184 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Spin and charge excitations in the correlated multiband metal $Ca_{3}Ru_{2}O_{7}$ |
| 260 | _ | _ | |a Woodbury, NY |c 2021 |b Inst. |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a 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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| 773 | 1 | 8 | |a 10.1103/physrevb.103.085108 |b American Physical Society (APS) |d 2021-02-05 |n 8 |p 085108 |3 journal-article |2 Crossref |t Physical Review B |v 103 |y 2021 |x 2469-9950 |
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