Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3

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

doi:10.1103/PhysRevLett.119.196402

Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3

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

Sub Inorganic Chemistry and Catalysis

Research output: Contribution to journal › Article › Academic › peer-review

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
Number of pages	6
Journal	Physical Review Letters
Volume	119
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.119.196402
Publication status	Published - 7 Nov 2017

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Tomiyasu, K., Okamoto, J., Huang, H. Y., Chen, Z. Y., Sinaga, E. P., Wu, W. B., Chu, A. 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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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.",

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AU - Tomiyasu, K.

AU - Okamoto, Jun

AU - Huang, H. Y.

AU - Chen, Z. Y.

AU - Sinaga, E. P.

AU - Wu, W. B.

AU - Chu, Audrey 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, Di Jing

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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