Spin and charge excitations in the correlated multiband metal Ca3Ru2O7
SCIE
SCOPUS
- Title
- Spin and charge excitations in the correlated multiband metal Ca3Ru2O7
- Authors
- Bertinshaw, J.; Krautloher, M.; Suzuki, H.; Takahashi, H.; Ivanov, A.; Yavaş, H.; Kim, B. J.; Gretarsson, H.; Keimer, B.
- Date Issued
- 2021-02
- Publisher
- AMER PHYSICAL SOC
- Abstract
- We use Ru L-3-edge resonant inelastic x-ray scattering to study the full range of excitations in Ca3Ru2O7 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 similar to 30 meV and a gap of similar to 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 Ca2RuO4. But whereas Ca2RuO4 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 Ca3Ru2O7, even as the excitations become strongly mixed in the presence of itinerant electrons.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/106875
- DOI
- 10.1103/physrevb.103.085108
- ISSN
- 2469-9950
- Article Type
- Article
- Citation
- Physical Review b, vol. 103, no. 8, 2021-02
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