Kazuhiko Ikeuchi

High-energy spin and charge excitations in electron-doped copper oxide superconductors

The evolution of electronic (spin and charge) excitations upon carrier doping is an extremely important issue in superconducting layered cuprates and the knowledge of its asymmetry between electron- and hole-dopings is still fragmentary. Here we combine X-ray and neutron inelastic scattering measurements to track the doping dependence of both spin and charge excitations in electron-doped materials. Copper L3 resonant inelastic X-ray scattering spectra show that magnetic excitations shift to higher energy upon doping. Their dispersion becomes steeper near the magnetic zone centre and they deeply mix with charge excitations, indicating that electrons acquire a highly itinerant character in the doped metallic state. Moreover, above the magnetic excitations, an additional dispersing feature is observed near the Γ-point, and we ascribe it to particle-hole charge excitations. These properties are in stark contrast with the more localized spin excitations (paramagnons) recently observed in hole-doped compounds even at high doping levels.

Effects of cation-size variance on spin and orbital orders in Eu 1-x(La0.254Y0.746)xVO3

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Resonant inelastic x-ray scattering study of intraband charge excitations in hole-doped high- T c cuprates

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Growth, Characterization and Application of Single-Crystal La2-xSrxCuO4 Having a Gradient in Sr Concentration

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Spin excitations in optimally P-doped BaFe2(As0.7P0.3)2 superconductor

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Ener gy- and Q-Resolution Investigations of a Chopper Spectrometer 4SEASONS at J-PARC

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Background Caused by Continuously Emitted High-Energy Neutrons at the Chopper Spectrometer 4SEASONS

rare earth or Y) size variance effect on spin/orbital order in Eu

Detailed Study of the Phase Diagram of Fe-based Superconductor Ba(Fe1-xCox)2As2 by Super High-Resolution Neutron Diffraction Measurements

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On the Superconducting Symmetry of Fe-Based Systems —Impurity Effects and Microscopic Magnetic Behavior—

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