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Charge excitations in the stripe-ordered La$$_{5/3}$$Sr$$_{1/3}$$NiO$$_{4}$$ and La$$_{2-x}$$(Ba,Sr)$$_{x}$$CuO$$_{4}$$ superconducting compounds

Wakimoto, Shuichi; Kimura, Hiroyuki*; Ishii, Kenji; Ikeuchi, Kazuhiko; Adachi, Tadashi*; Fujita, Masaki*; Kakurai, Kazuhisa; Koike, Yoji*; Mizuki, Junichiro; Noda, Yukio*; Yamada, Kazuyoshi*; Said, A. H.*; Shvyd'ko, Y.*

Charge excitations in stripe-ordered 214 compounds, La$$_{5/3}$$Sr$$_{1/3}$$NiO$$_{4}$$ and 1/8-doped La$$_{2-x}$$(Ba, Sr)$$_{x}$$CuO$$_{4}$$ are studied using resonant inelastic X-ray scattering in hard X-ray regime. We are observing $$simeq 1$$ eV excitations with the 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.

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Category:Physics, Multidisciplinary

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