Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering

M. Yoshida, K. Ishii, M. Naka, S. Ishihara, I. Jarrige, K. Ikeuchi, Y. Murakami, Kazutaka Kudo, Y. Koike, T. Nagata, Y. Fukada, Naoshi Ikeda, J. Mizuki

Research output: Contribution to journalArticle

Abstract

In strongly correlated electron systems, enhanced fluctuations in the proximity of the ordered states of electronic degrees of freedom often induce anomalous electronic properties such as unconventional superconductivity. While spin fluctuations in the energy-momentum space have been studied widely using inelastic neutron scattering, other degrees of freedom, i.e., charge and orbital, have hardly been explored thus far. Here, we use resonant inelastic X-ray scattering to observe charge fluctuations proximate to the charge-order phase in transition metal oxides. In the two-leg ladder of Sr14-xCaxCu24O41, charge fluctuations are enhanced at the propagation vector of the charge order (qCO) when the order is melted by raising temperature or by doping holes. In contrast, charge fluctuations are observed not only at qCO but also at other momenta in a geometrically frustrated triangular bilayer lattice of LuFe2O4. The observed charge fluctuations have a high energy (∼1 eV), suggesting that the Coulomb repulsion between electrons plays an important role in the formation of the charge order.

Original languageEnglish
Article number23611
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - Mar 29 2016

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momentum
scattering
x rays
degrees of freedom
electronics
ladders
metal oxides
proximity
inelastic scattering
neutron scattering
electrons
superconductivity
kinetic energy
transition metals
orbitals
propagation
temperature
energy

ASJC Scopus subject areas

  • General

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Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering. / Yoshida, M.; Ishii, K.; Naka, M.; Ishihara, S.; Jarrige, I.; Ikeuchi, K.; Murakami, Y.; Kudo, Kazutaka; Koike, Y.; Nagata, T.; Fukada, Y.; Ikeda, Naoshi; Mizuki, J.

In: Scientific Reports, Vol. 6, 23611, 29.03.2016.

Research output: Contribution to journalArticle

Yoshida, M, Ishii, K, Naka, M, Ishihara, S, Jarrige, I, Ikeuchi, K, Murakami, Y, Kudo, K, Koike, Y, Nagata, T, Fukada, Y, Ikeda, N & Mizuki, J 2016, 'Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering', Scientific Reports, vol. 6, 23611. https://doi.org/10.1038/srep23611
Yoshida, M. ; Ishii, K. ; Naka, M. ; Ishihara, S. ; Jarrige, I. ; Ikeuchi, K. ; Murakami, Y. ; Kudo, Kazutaka ; Koike, Y. ; Nagata, T. ; Fukada, Y. ; Ikeda, Naoshi ; Mizuki, J. / Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering. In: Scientific Reports. 2016 ; Vol. 6.
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AU - Naka, M.

AU - Ishihara, S.

AU - Jarrige, I.

AU - Ikeuchi, K.

AU - Murakami, Y.

AU - Kudo, Kazutaka

AU - Koike, Y.

AU - Nagata, T.

AU - Fukada, Y.

AU - Ikeda, Naoshi

AU - Mizuki, J.

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