Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3
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Publication date
2017-11-07
Authors
Tomiyasu, K.
Okamoto, Jun
Huang, H. Y.
Chen, Z. Y.
Sinaga, E. P.
Wu, W. B.
Chu, Audrey Y
Singh, A.
Wang, Ru Pan
de Groot, Frank
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Article
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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.
Keywords
General Physics and Astronomy
Citation
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, vol. 119, no. 19, 196402. https://doi.org/10.1103/PhysRevLett.119.196402