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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/118828

    Title: Low energy orbital excitations in strained LaCoO3 films
    Authors: Wang, Ru-Pan;Geessinck, Jaap;Elnaggar, Hebatalla;Tomiyasu, Keisuke;Okamoto, Jun;Liu, Boyang;Du, Chao-Hung;Huang, Di-Jing;Gertjan Koster;Groot, Frank M. F. de
    Date: 2019-10-31
    Issue Date: 2020-07-01 12:11:21 (UTC+8)
    Abstract: We present 90 meV resolved Co 2p3d resonant inelastic x-ray scattering linear dichroism spectra of strained LaCoO3 films and a LaCoO3 single crystal. A polarization-dependent low-energy excitation is observed at ∼0.2eV on the tensile-strained LaCoO3/SrTiO3 film, while it is not observed in either bulk LaCoO3 or the compressive-strained LaCoO3/LaAlO
    3 film. Guided by cluster calculations, we are able to distinguish the spin-state manifolds close to their transition point of Co3+ ions in
    LaCoO3 systems. Through a polarization analysis, we show that the spin state can easily flip from a low-spin 1A1g state in an octahedral symmetry to the high-spin 5B2g or 5Eg states with a small tetragonal distortion. A mixture of spin states suggests that the high-spin
    Co3+ plays an important role in long-range ferromagnetic order on both tensile- and compressive-strained LaCoO3 films.
    Relation: Phys. Rev. B 100(16), 165148
    DOI: 10.1103/PhysRevB.100.165148
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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