| Autor: |
Roth, Friedrich, Revcolevschi, Alexandre, Büchner, Bernd, Knupfer, Martin, Fink, Jörg |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B 101, 195132 (2020) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.101.195132 |
| Popis: |
The knowledge of the charge carrier distribution among the different orbitals of Cu and O is a precondition for the understanding of the physical properties of various Cu-O frameworks. We employ electron energy-loss spectroscopy to elucidate the charge carrier plasmon dispersion in (La, Ca)$_x$Sr$_{14-x}$Cu$_{24}$O$_{41}$ in dependency of $x$ as well as temperature. We observe that the energy of the plasmon increases upon increasing Ca content, which signals an internal charge redistribution between the two Cu-O subsystems. Moreover, contrary to an uncorrelated model we come to the conclusion that the holes transferred to the Cu$_2$O$_3$ ladders are mainly located in the bonding and not in the anti-bonding band. This is caused by an orbital dependent Mott transition. |
| Databáze: |
arXiv |
| Externí odkaz: |
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