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Dispersive collective charge modes in an incommensurately modulated cuprate Mott insulator

Wray, L. and Qian, D. and Hsieh, D. and Xia, Y. and Eisaki, H. and Hasan, M. Z. (2007) Dispersive collective charge modes in an incommensurately modulated cuprate Mott insulator. Physical Review B, 76 . Art. No. 100507(R). ISSN 1098-0121. doi:10.1103/PhysRevB.76.100507.

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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.

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Hsieh, D.0000-0002-0812-955X
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.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG-02-05ER46200
Department of Energy (DOE)DOE W-31-10-Eng-38
Classification Code:PACS numbers: 74.72.Jt, 71.90.q, 72.80.Sk, 78.70.Ck
Record Number:CaltechAUTHORS:20140908-094730650
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49324
Deposited By: Joy Painter
Deposited On:08 Sep 2014 17:19
Last Modified:10 Nov 2021 18:42

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