Determination of boson spectrum from optical data in pseudogap phase of underdoped cuprates

Abstract

Information on the nature of the dominant inelastic processes operative in correlated metallic systems can be obtained from an analysis of their AC optical response. An electron-boson spectral density can usefully be extracted. This density is closely related to the optical scattering rate. However, in the underdoped region of the high Tc cuprate phase diagram a new energy scale (the pseudogap) emerges, which alters the optical scattering and needs to be taken into account in any fit to data. This can influence the shape and strength of the recovered boson spectral function. Including a pseudogap in an extended maximum entropy inversion for optimally doped Bi-2212 is more consistent with existing data than when it is left out as done previously.

18 pages, 5 figures

References in corpus (9)

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• Evidence for a pseudogap in underdoped $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$ and $YB{a}_{2}C{u}_3{O}_{6.50}$ from in-plane optical conductivity measurements
• Spin Dynamics in Cuprates: Optical Conductivity of HgBa2CuO4
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• Generalized Drude Scattering rate from the memory function formalism: an independent verification of the Sharapov-Carbotte result
• Evolution of electron-boson spectral density in the underdoped region of Bi_2Sr_{2-x}La_xCuO_6
• High energy fluctuation spectra in cuprates from infrared optical spectroscopy
• A comparative study of finite frequency scattering rate from Allen, Mitrović-Fiorucci, Shulga-Dolgov-Maksimov, Sharapov-Carbotte and Götze-Wölfle Memory Function formalisms
• Simulation of a hump structure in the optical scattering rate within a generalized Allen formalism and its application to copper oxide systems