Damping of spinful excitons in LaCoO3 by thermal fluctuations: Theory and experiment

Atsushi Hariki, Ru-Pan Wang, Andrii Sotnikov, Keisuke Tomiyasu, Davide Betto, Nicholas B. Brookes, Yohei Uemura, Mahnaz Ghiasi, Frank M. F. de Groot, and Jan Kuneš
Phys. Rev. B 101, 245162 – Published 26 June 2020
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  • INTRODUCTION
  • EXPERIMENT
  • THEORY
  • DISCUSSION
  • CONCLUSIONS
  • ACKNOWLEDGMENTS
    • Supplemental Material
    References

    Abstract

    We present Co L3-edge resonant inelastic x-ray scattering (RIXS) of bulk LaCoO3 across the thermally induced spin-state crossover around 100 K. Owing to a high energy resolution of 25 meV, we observe unambiguously the dispersion of the intermediate-spin (IS) excitations in the low-temperature regime. Approaching the intermediate temperature regime, the IS excitations are damped and the bandwidth is reduced. The observed behavior can be well described by a model of mobile IS excitons with strong attractive interaction, which we solve by using dynamical mean-field theory for hard-core bosons. Our results provide a detailed mechanism of how high-spin and IS excitations interact to establish the physical properties of cobaltite perovskites.

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    • Received 9 December 2019
    • Revised 18 March 2020
    • Accepted 18 May 2020

    DOI:https://doi.org/10.1103/PhysRevB.101.245162

    ©2020 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Hard-core bosonsQuasiparticles & collective excitationsSpin state transition
    1. Physical Systems
    CobaltatesTransition metal oxides
    1. Techniques
    Dynamical mean field theoryResonant inelastic x-ray scattering
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Atsushi Hariki1,2, Ru-Pan Wang3, Andrii Sotnikov1,4, Keisuke Tomiyasu5,6, Davide Betto7, Nicholas B. Brookes7, Yohei Uemura3, Mahnaz Ghiasi3, Frank M. F. de Groot3, and Jan Kuneš1,8

    • 1Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
    • 2Department of Physics and Electronics, Graduate School of Engineering, Osaka Prefecture University 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
    • 3Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, Netherlands
    • 4Akhiezer Institute for Theoretical Physics, NSC KIPT, Akademichna 1, 61108 Kharkiv, Ukraine
    • 5Department of Physics, Tohoku University, Aoba, Sendai 980-8578, Japan
    • 6NISSAN ARC, LTD., 1, Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
    • 7European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS40220, F-38043 Grenoble Cedex 9, France
    • 8Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Praha 8, Czech Republic

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    Issue

    Vol. 101, Iss. 24 — 15 June 2020

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