Charge-transfer exciton in La2CuO4 probed with resonant inelastic x-ray scattering

Details Charge-transfer exciton in La2CuO4 probed with resonant inelastic x-ray scattering Charge-transfer exciton in La2CuO4 probed with resonant inelastic x-ray scattering

2007-09-11

arxiv.org/abs/0709.1705v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.060501

We report a high-resolution resonant inelastic x-ray scattering study of La2CuO4. A number of spectral features are identified that were not clearly visible in earlier lower-resolution data. The momentum dependence of the spectral weight and the dispersion of the lowest energy excitation across the insulating gap have been measured in detail. The temperature dependence of the spectral features was also examined. The observed charge transfer edge shift, along with the low dispersion of the first charge transfer excitation are attributed to the lattice motion being coupled to the electronic system. In addition, we observe a dispersionless feature at 1.8 eV, which is associated with a d-d crystal field excitation.

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