Spin and orbital excitations through the metal-to-insulator transition in Cd2Os2 O7 probed with high-resolution resonant inelastic x-ray scattering

J. G. Vale, S. Calder, N. A. Bogdanov, C. Donnerer, M. Moretti Sala, N. R. Davies, D. Mandrus, J. Van Den Brink, A. D. Christianson, D. F. McMorrow

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Abstract

High-resolution resonant inelastic x-ray scattering measurements (ΔE=46meV) have been performed on Cd2Os2O7 through the metal-to-insulator transition (MIT). A magnetic excitation at 125 meV evolves continuously through the MIT, in agreement with recent Raman-scattering results, and provides further confirmation for an all-in all-out magnetic ground state. Asymmetry of this feature is likely a result of coupling between the electronic and the magnetic degrees of freedom. We also observe a broad continuum of interband excitations centered at 0.3 eV energy loss. This is indicative of significant hybridization between Os 5d and O 2p states and the concurrent itinerant nature of the system. In turn, this suggests a possible breakdown of the free-ion model for Cd2Os2O7.

Original languageEnglish
Article number014441
JournalPhysical Review B
Volume101
Issue number1
DOIs
StatePublished - Jan 27 2020

Funding

Research in London was supported by the Engineering and Physical Sciences Research Council (Grants No. EP/N027671/1 and No. EP/N034872/1). Work at ORNL's High Flux Isotope Reactor was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy (DOE). J.G.V. would like to thank University College London (UCL) and École Polytechnique Fédérale de Lausanne (EPFL) for financial support through a UCL Impact award. A.D.C. and D.M. acknowledges support from the U.S. Department of Energy, Office of Science – Basic Energy Sciences (BES), Materials Sciences and Engineering Division.

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