Observation of spin-orbit excitations and Hund's multiplets in Ca2RuO4

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Title
Observation of spin-orbit excitations and Hund's multiplets in Ca2RuO4
Author(s)
Gretarsson, H; Suzuki, H; Hoon Kim; Ueda, K; Krautloher, M; B. J. Kim; Yavas, H; Khaliullin, G; Keimer, B
Publication Date
2019-07
Journal
PHYSICAL REVIEW B, v.100, no.4, pp. -
Publisher
AMER PHYSICAL SOC
Abstract
We use Ru L-3-edge (2838.5 eV) resonant inelastic x-ray scattering (RIXS) to quantify the electronic structure of Ca2RuO4, a layered 4d-electron compound that exhibits a correlation-driven metal-insulator transition and unconventional antiferromagnetism. We observe a series of Ru intraionic transitions whose energies and intensities are well described by model calculations. In particular, we find a J = 0 -> 2 spin-orbit excitation at 320 meV, as well as Hund's-rule driven S = 1 -> 0 spin-state transitions at 750 and 1000 meV. The energy of these three features uniquely determines the spin-orbit coupling, tetragonal crystal-field energy, and Hund's rule interaction. The parameters inferred from the RIXS spectra are in excellent agreement with the picture of excitonic magnetism that has been devised to explain the collective modes of the antiferromagnetic state. L-3-edge RIXS of Ru compounds and other 4d-electron materials thus enables direct measurements of interactions parameters that are essential for realistic model calculations. ©2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6138
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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