Plasmons and Interband Transitions of Ca${}_{11}$Sr${}_3$Cu${}_{24}$O${}_{41}$ investigated by Electron Energy-Loss Spectroscopy

Abstract

Electron energy-loss spectroscopy studies have been performed in order to get a deeper insight into the electronic structure and elementary excitations of the two-leg ladder system Ca${}_{11}$Sr${}_3$Cu${}_{24}$O${}_{41}$. We find a strong anisotropy of the loss function for momentum transfers along the a and c-crystallographic axis, and a remarkable linear plasmon dispersion for a momentum transfer parallel to the legs of the ladders. The investigated spectral features are attributed to localized and delocalized charge-transfer excitations and the charge carrier plasmon. The charge carrier plasmon position and dispersion in the long wave-length limit agree well with expectations based upon the band structure of the two-leg ladder, while the observed quasi-linear plasmon dispersion might be related to the peculiar properties of underdoped cuprates in general.

arXiv comment16 pages, 8 figures

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• Semiconductor-to-Metal Transition in the Bulk of WSe2 upon Potassium Intercalation
• Evidence for an orbital dependent Mott transition in the ladders of (La,Ca)${}_x$Sr${}_{14-x}$Cu${}_{24}$O${}_{41}$ derived by electron energy-loss spectroscopy
• Superconductivity-Induced Changes in Density-Density Correlation Function Enabled by Umklapp Processes