Coulomb correlations intertwined with spin and orbital excitations in LaCoO$_3$
| Autor: | 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. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 119, 196402 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.119.196402 |
| Popis: | We carried out temperature-dependent (20 - 550 K) measurements of resonant inelastic X-ray scattering on LaCoO$_3$ to investigate the evolution of its electronic structure across the spin-state crossover. In combination with charge-transfer multiplet calculations, we accurately quantized the renormalized crystal-field excitation energies and spin-state populations. We show that the screening of the on-site Coulomb interaction of 3d electrons is orbital selective and coupled to the spin-state crossover in LaCoO$_3$. 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. Comment: 6 pages, 4 figures. Submitted to Phys. Rev. Lett |
| Databáze: | arXiv |
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