Dispersive collective charge modes in an incommensurately modulated cuprate Mott insulator
L. Wray, D. Qian, D. Hsieh, Y. Xia, H. Eisaki, M. Z. Hasan
DOI 10.1103/PhysRevB.76.100507 · Physical Review B
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Abstract
We report measurement of collective charge modes of insulating Sr14Cu24O41 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⪢tladder>tchain, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr14-xCaxCu24O41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | 3 GPa | unknown |
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