酸素K吸収端共鳴非弾性X線散乱によるホールドープした銅酸化物における電荷励起の運動量依存性の観測 Observation of momentum-dependent charge excitations in hole-doped cuprates using resonant inelastic X-ray scattering at the oxygen K edge
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We investigate electronic excitations in La2-x(Br,Sr)_xCuO_4 using resonant inelastic X-ray scattering (RIXS) at the oxygen K edge. We observed momentum-dependent spectral weight below 1 eV, which is consistent with theoretical calculation of the dynamical charge structure factor on oxygen orbitals in a three-band Hubbard model. Our results confirm that the momentum-dependent charge excitations exist on the order of the transfer energy (t), and the broad spectral line shape indicates damped and incoherent character of the charge excitations at the energy range in the doped Mott insulators.
- Physical Review B
Physical Review B 96(11), 115148\_1-115148\_8, 2017-09
American Physical Society