Post-growth annealing effects on charge and spin excitations in ND2-xCexCuO4

We report a Cu K- and L3-edge resonant inelastic x-ray scattering study of charge and spin excitations of bulk Nd2-xCexCuO4, with focus on post-growth annealing effects. For the parent compound Nd2CuO4 (x = 0), a clear charge-transfer gap is observed in the as-grown state, whereas the charge excitat...

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Veröffentlicht in:Physical review materials 2021-02, Vol.5 (2)
Hauptverfasser: Ishii, Kenji, Asano, Shun, Ashida, Masumi, Fujita, Masaki, Yu, Biqiong, Greven, Martin, Okamoto, Jun, Huang, Di-Jing, Mizuki, Jun'ichiro
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container_issue 2
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container_title Physical review materials
container_volume 5
creator Ishii, Kenji
Asano, Shun
Ashida, Masumi
Fujita, Masaki
Yu, Biqiong
Greven, Martin
Okamoto, Jun
Huang, Di-Jing
Mizuki, Jun'ichiro
description We report a Cu K- and L3-edge resonant inelastic x-ray scattering study of charge and spin excitations of bulk Nd2-xCexCuO4, with focus on post-growth annealing effects. For the parent compound Nd2CuO4 (x = 0), a clear charge-transfer gap is observed in the as-grown state, whereas the charge excitation spectra indicate that electrons are doped in the annealed state. This is consistent with the observation that annealed thin-film and polycrystalline samples of RE2CuO4 (RE = rare earth) can become metallic and superconducting at sufficiently high electron concentrations without Ce doping. For x = 0.16, a Ce concentration for which it is known that oxygen reduction destroys long-range antiferromagnetic order and induces superconductivity, we find that the high-energy spin excitations of non-superconducting as-grown and superconducting annealed crystals are nearly identical. This finding is in stark contrast to the significant changes in the low-energy spin excitations previously observed via neutron scattering
doi_str_mv 10.1103/PhysRevMaterials.5.024803
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title Post-growth annealing effects on charge and spin excitations in ND2-xCexCuO4
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