Dispersive collective charge modes in an incommensurately modulated cuprate Mott insulator
- Creators
- Wray, L.
- Qian, D.
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Hsieh, D.
- Xia, Y.
- Eisaki, H.
- Hasan, M. Z.
Abstract
We report measurement of collective charge modes of insulating Sr_(14)Cu_(24)O_(41) using inelastic resonant x-ray scattering over the complete Brillouin zone. Our results show that the intense excitation modes at the charge gap edge predominantly originate from ladder-containing planar substructures. The observed modes are found to be dispersive for momentum transfers along the "legs" (ℏQ⃗ ∥∥ĉ ) but nearly localized along the "rungs" (ℏQ⃗ ∥∥â ). We show that the dispersion and peak width characteristics of the modes can be understood in the strong-coupling quantum limit (Hubbard U⪢t_(ladder)>t_(chain), where t is the hopping parameter). Quite generally, we demonstrate that the momentum tunability (Q⃗ resolution) of inelastic x-ray scattering can be utilized to resolve mode contributions in multicomponent incommensurate quantum electron systems.
Additional Information
© 2007 The American Physical Society. Received 30 May 2007. Revised 31 July 2007. Published 19 September 2007. We gratefully acknowledge D. Huse, E. Isaacs, R. S. Markiewcz, T. Gog, and D. Casa. This work is primarily supported by DOE Grant No. DE-FG-02-05ER46200. The use of APS is supported by DOE W-31-10-Eng-38.Attached Files
Published - PhysRevB.76.100507.pdf
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Additional details
- Eprint ID
- 49324
- Resolver ID
- CaltechAUTHORS:20140908-094730650
- DE-FG-02-05ER46200
- Department of Energy (DOE)
- DOE W-31-10-Eng-38
- Department of Energy (DOE)
- Created
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2014-09-08Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field