Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering

L. Das; F. Forte; R. Fittipaldi; C. G. Fatuzzo; V. Granata; O. Ivashko; M. Horio; F. Schindler; M. Dantz; Yi Tseng; D. E. McNally; M. Rønnow; W. Wan; Niels Bech Christensen; J. Pelliciari; P. Olalde-Velasco; N. Kikugawa; T. Neupert; A. Vecchione; T. Schmitt; M. Cuoco; J. Chang

doi:10.1103/PhysRevX.8.011048

Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering

L. Das, F. Forte, R. Fittipaldi, C. G. Fatuzzo, V. Granata, O. Ivashko, M. Horio, F. Schindler, M. Dantz, Yi Tseng, D. E. McNally, M. Rønnow, W. Wan, Niels Bech Christensen, J. Pelliciari, P. Olalde-Velasco, N. Kikugawa, T. Neupert, A. Vecchione, T. SchmittM. Cuoco, J. Chang

Department of Physics

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Abstract

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.

Original language	English
Article number	011048
Journal	Physical Review X
Volume	8
Issue number	1
Number of pages	9
ISSN	2160-3308
DOIs	https://doi.org/10.1103/PhysRevX.8.011048
Publication status	Published - 2018

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Das, L., Forte, F., Fittipaldi, R., Fatuzzo, C. G., Granata, V., Ivashko, O., Horio, M., Schindler, F., Dantz, M., Tseng, Y., McNally, D. E., Rønnow, M., Wan, W., Christensen, N. B., Pelliciari, J., Olalde-Velasco, P., Kikugawa, N., Neupert, T., Vecchione, A., ... Chang, J. (2018). Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering. Physical Review X, 8(1), Article 011048 . https://doi.org/10.1103/PhysRevX.8.011048

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title = "Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering",

abstract = "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.",

author = "L. Das and F. Forte and R. Fittipaldi and Fatuzzo, {C. G.} and V. Granata and O. Ivashko and M. Horio and F. Schindler and M. Dantz and Yi Tseng and McNally, {D. E.} and M. R{\o}nnow and W. Wan and Christensen, {Niels Bech} and J. Pelliciari and P. Olalde-Velasco and N. Kikugawa and T. Neupert and A. Vecchione and T. Schmitt and M. Cuoco and J. Chang",

year = "2018",

doi = "10.1103/PhysRevX.8.011048",

language = "English",

volume = "8",

journal = "Physical Review X",

issn = "2160-3308",

publisher = "American Physical Society",

number = "1",

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Das, L, Forte, F, Fittipaldi, R, Fatuzzo, CG, Granata, V, Ivashko, O, Horio, M, Schindler, F, Dantz, M, Tseng, Y, McNally, DE, Rønnow, M, Wan, W, Christensen, NB, Pelliciari, J, Olalde-Velasco, P, Kikugawa, N, Neupert, T, Vecchione, A, Schmitt, T, Cuoco, M & Chang, J 2018, 'Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering', Physical Review X, vol. 8, no. 1, 011048 . https://doi.org/10.1103/PhysRevX.8.011048

TY - JOUR

T1 - Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering

AU - Das, L.

AU - Forte, F.

AU - Fittipaldi, R.

AU - Fatuzzo, C. G.

AU - Granata, V.

AU - Ivashko, O.

AU - Horio, M.

AU - Schindler, F.

AU - Dantz, M.

AU - Tseng, Yi

AU - McNally, D. E.

AU - Rønnow, M.

AU - Wan, W.

AU - Christensen, Niels Bech

AU - Pelliciari, J.

AU - Olalde-Velasco, P.

AU - Kikugawa, N.

AU - Neupert, T.

AU - Vecchione, A.

AU - Schmitt, T.

AU - Cuoco, M.

AU - Chang, J.

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevX.8.011048

DO - 10.1103/PhysRevX.8.011048

M3 - Journal article

SN - 2160-3308

VL - 8

JO - Physical Review X

JF - Physical Review X

IS - 1

M1 - 011048

ER -

Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering

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