Charge excitations associated with charge stripe order in the 214-type nickelate and superconducting cuprate

Details Charge excitations associated with charge stripe order in the 214-type nickelate and superconducting cuprate Charge excitations associated with charge stripe order in the 214-type nickelate and superconducting cuprate

2008-06-20

arxiv.org/abs/0806.3302v1

Phys. Rev. Lett. 102, 157001 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

Charge excitations were studied for stipe-ordered 214 compounds, La$_{5/3}$Sr$_{1/3}$NiO$_{4}$ and 1/8-doped La$_{2}$(Ba, Sr)$_{x}$CuO$_{4}$ using resonant inelastic x-ray scattering in hard x-ray regime. We have observed charge excitations at the energy transfer of 1 eV with the momentum transfer corresponding to the charge stripe spatial period both for the diagonal (nikelate) and parallel (cuprates) stripes. These new excitations can be interpreted as a collective stripe excitation or charge excitonic mode to a stripe-related in-gap state.

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