Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3

K. Tomiyasu; J. Okamoto; H. Y. Huang; Z. Y. Chen; E. P. Sinaga; W. B. Wu; Y. Y. Chu; A. Singh; R. P. Wang; F. M.F. De Groot; A. Chainani; S. Ishihara; C. T. Chen; D. J. Huang

doi:10.1103/PhysRevLett.119.196402

Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3

K. Tomiyasu, J. Okamoto, H. Y. Huang, Z. Y. Chen, E. P. Sinaga, W. B. Wu, Y. Y. Chu, A. Singh, R. P. Wang, F. M.F. De Groot, A. Chainani, S. Ishihara, C. T. Chen, D. J. Huang

Department of Physics

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34 Citations (Scopus)

Abstract

We carried out temperature-dependent (20-550 K) measurements of resonant inelastic x-ray scattering on LaCoO3 to investigate the evolution of its electronic structure across the spin-state crossover. In combination with charge-transfer multiplet calculations, we accurately quantified the renomalized crystal-field excitation energies and spin-state populations. We show that the screening of the effective on-site Coulomb interaction of 3d electrons is orbital selective and coupled to the spin-state crossover in LaCoO3. The results establish that the gradual spin-state crossover is associated with a relative change of Coulomb energy versus bandwidth, leading to a Mott-type insulator-to-metal transition.

Original language	English
Article number	196402
Journal	Physical review letters
Volume	119
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.119.196402
Publication status	Published - 2017 Nov 7

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.119.196402

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Tomiyasu, K., Okamoto, J., Huang, H. Y., Chen, Z. Y., Sinaga, E. P., Wu, W. B., Chu, Y. Y., Singh, A., Wang, R. P., De Groot, F. M. F., Chainani, A., Ishihara, S., Chen, C. T., & Huang, D. J. (2017). Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3. Physical review letters, 119(19), Article 196402. https://doi.org/10.1103/PhysRevLett.119.196402

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title = "Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3",

abstract = "We carried out temperature-dependent (20-550 K) measurements of resonant inelastic x-ray scattering on LaCoO3 to investigate the evolution of its electronic structure across the spin-state crossover. In combination with charge-transfer multiplet calculations, we accurately quantified the renomalized crystal-field excitation energies and spin-state populations. We show that the screening of the effective on-site Coulomb interaction of 3d electrons is orbital selective and coupled to the spin-state crossover in LaCoO3. The results establish that the gradual spin-state crossover is associated with a relative change of Coulomb energy versus bandwidth, leading to a Mott-type insulator-to-metal transition.",

author = "K. Tomiyasu and J. Okamoto and Huang, {H. Y.} and Chen, {Z. Y.} and Sinaga, {E. P.} and Wu, {W. B.} and Chu, {Y. Y.} and A. Singh and Wang, {R. P.} and {De Groot}, {F. M.F.} and A. Chainani and S. Ishihara and Chen, {C. T.} and Huang, {D. J.}",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

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doi = "10.1103/PhysRevLett.119.196402",

language = "English",

volume = "119",

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T1 - Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3

AU - Tomiyasu, K.

AU - Okamoto, J.

AU - Huang, H. Y.

AU - Chen, Z. Y.

AU - Sinaga, E. P.

AU - Wu, W. B.

AU - Chu, Y. Y.

AU - Singh, A.

AU - Wang, R. P.

AU - De Groot, F. M.F.

AU - Chainani, A.

AU - Ishihara, S.

AU - Chen, C. T.

AU - Huang, D. J.

PY - 2017/11/7

Y1 - 2017/11/7

N2 - We carried out temperature-dependent (20-550 K) measurements of resonant inelastic x-ray scattering on LaCoO3 to investigate the evolution of its electronic structure across the spin-state crossover. In combination with charge-transfer multiplet calculations, we accurately quantified the renomalized crystal-field excitation energies and spin-state populations. We show that the screening of the effective on-site Coulomb interaction of 3d electrons is orbital selective and coupled to the spin-state crossover in LaCoO3. The results establish that the gradual spin-state crossover is associated with a relative change of Coulomb energy versus bandwidth, leading to a Mott-type insulator-to-metal transition.

AB - We carried out temperature-dependent (20-550 K) measurements of resonant inelastic x-ray scattering on LaCoO3 to investigate the evolution of its electronic structure across the spin-state crossover. In combination with charge-transfer multiplet calculations, we accurately quantified the renomalized crystal-field excitation energies and spin-state populations. We show that the screening of the effective on-site Coulomb interaction of 3d electrons is orbital selective and coupled to the spin-state crossover in LaCoO3. The results establish that the gradual spin-state crossover is associated with a relative change of Coulomb energy versus bandwidth, leading to a Mott-type insulator-to-metal transition.

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Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3

Abstract

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