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The knowledge of the charge carrier distribution among the different orbitalsof Cu and O is a precondition for the understanding of the physical propertiesof various Cu-O frameworks. We employ electron energy-loss spectroscopy toelucidate the charge carrier plasmon dispersion in (La,Ca)$_x$Sr$_{14-x}$Cu$_{24}$O$_{41}$ in dependency of $x$ as well astemperature. We observe that the energy of the plasmon increases uponincreasing Ca content, which signals an internal charge redistribution betweenthe two Cu-O subsystems. Moreover, contrary to an uncorrelated model we come tothe conclusion that the holes transferred to the Cu$_2$O$_3$ ladders are mainlylocated in the bonding and not in the anti-bonding band. This is caused by anorbital dependent Mott transition.

physical review. b./physical review. b

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