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Coulomb correlations intertwined with spin and orbital excitations in LaCoO₃

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arxiv 1708.04417 v1 pith:O54MRVMB submitted 2017-08-15 cond-mat.str-el

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
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R.-P. Wang F. M. F. de Groot A. Chainani S. Ishihara C. T. Chen D. J. Huang
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classification cond-mat.str-el
keywords spin-statecoulombcrossoverlacooorbitalaccuratelyacrossassociated
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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.

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