Journal
PHYSICAL REVIEW X
Volume 8, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.8.011048
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Funding
- Swiss National Science Foundation through the SINERGIA network Mott Physics beyond the Heisenberg Model
- NCCR MARVEL
- SNSF DACH [BSSGI0-155873, 200021-169061, P2FRP2-171824, 200021L-141325]
- Swiss Government
- CNR Short Term Mobility Program
- Dysenos AG by Kabelwerke Brugg AG Holding
- Fachhochschule Nordwestschweiz
- Paul Scherrer Institute
- Swiss National Science Foundation Early Postdoc. Mobility Fellowship [P2FRP-171824]
- European Community [290605]
- SEP [(511-6/17-8017) PTC-553]
- VIEP-BUAP [OLVP-exc17]
- Danish Center for Synchrotron and Neutron Science (DanScatt)
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The strongly correlated insulator Ca2RuO4 is considered as a paradigmatic realization of both spin-orbital physics and a band-Mott insulating phase, characterized by orbitally selective coexistence of a band and a Mott gap. We present a high resolution oxygen K-edge resonant inelastic x-ray scattering study of the antiferromagnetic Mott insulating state of Ca2RuO4. A set of low-energy (about 80 and 400 meV) and high-energy (about 1.3 and 2.2 eV) excitations are reported, which show strong incident light polarization dependence. Our results strongly support a spin-orbit coupled band-Mott scenario and explore in detail the nature of its exotic excitations. Guided by theoretical modeling, we interpret the low-energy excitations as a result of composite spin-orbital excitations. Their nature unveils the intricate interplay of crystal-field splitting and spin-orbit coupling in the band-Mott scenario. The high-energy excitations correspond to intra-atomic singlet-triplet transitions at an energy scale set by Hund's coupling. Our findings give a unifying picture of the spin and orbital excitations in the band-Mott insulator Ca2RuO4.
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