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, and D. J. Huang
Phys. Rev. Lett. 119, 196402 – Published 7 November 2017
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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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  • Received 29 June 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.196402

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

K. Tomiyasu1,*, J. Okamoto2, H. Y. Huang2, Z. Y. Chen3, E. P. Sinaga1, W. B. Wu2, Y. Y. Chu2, A. Singh2, R.-P. Wang4, F. M. F. de Groot4, A. Chainani2, S. Ishihara1, C. T. Chen2, and D. J. Huang2,3,†

  • 1Department of Physics, Tohoku University, Aoba, Sendai 980-8578, Japan
  • 2National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
  • 3Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
  • 4Inorganic Chemistry and Catalysis, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, Netherlands

  • *tomiyasu@m.tohoku.ac.jp
  • djhuang@nsrrc.org.tw

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Issue

Vol. 119, Iss. 19 — 10 November 2017

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