Charge excitations in stripe-ordered 214 compounds La5/3Sr1/3NiO4 and 1/8-doped La2-x(BaorSr)xCuO4 are studied using resonant inelastic x-ray scattering in the hard x-ray regime. We observe 1eV excitation with a momentum transfer corresponding to the charge stripe spatial period both for the diagonal (nickelate) and parallel (cuprates) stripes. They are interpreted as collective stripe excitations or anomalous softening of the charge excitonic modes of the in-gap states.
|Journal||Physical review letters|
|Publication status||Published - 2009 Apr 14|
ASJC Scopus subject areas
- Physics and Astronomy(all)