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Momentum Dependence of Charge Excitations in the Electron-Doped Superconductor Nd1.85Ce0.15CuO4: a RIXS Study

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arxiv cond-mat/0412467 v1 pith:FXDD5VMV submitted 2004-12-17 cond-mat.str-el

K. Ishii , K. Tsutsui , Y. Endoh , T. Tohyama , S. Maekawa , M. Hoesch , K. Kuzushita , M. Tsubota
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T. Inami J. Mizuki Y. Murakami K. Yamada
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keywords excitationschargerixscuo4electron-dopedenergyexcitationexperimental
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We report a resonant inelastic x-ray scattering (RIXS) study of charge excitations in the electron-doped high-Tc superconductor Nd1.85Ce0.15CuO4. The intraband and interband excitations across the Fermi energy are separated for the first time by tuning the experimental conditions properly to measure charge excitations at low energy. A dispersion relation with q-dependent width emerges clearly in the intraband excitation, while the intensity of the interband excitation is concentrated around 2 eV near the zone center. The experimental results are consistent with theoretical calculation of the RIXS spectra based on the Hubbard model.

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