Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-06-20
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.
Adachi Tadashi
Fujita Masaki
Ikeuchi Kazuhiko
Ishii Katsuyuki
Kakurai Kazuhisa
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