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25 April 2024

» arxiv » 0905.1381

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Alkali-metal intercalation of a low-dimensional Mott insulator -- electronic doping vs. electrostatic alloying and soft Coulomb gap
M. Sing ; S. Glawion ; M. Schlachter ; M. R. Scholz ; K. Goss ; J. Heidler ; R. Claessen ;
Date:	9 May 2009
Abstract:	The spectral weight evolution of the low-dimensional Mott insulator TiOCl upon alkali-metal dosing has been studied by photoelectron spectroscopy. Although we observe that electrons are doped into the Ti~3$d$ states, surprisingly a (soft) Coulomb gap persists. These findings are at variance with expectations within usual Mott-Hubbard scenarios. Against the background of recent {it ab initio} calculations, we identify n-doped TiOCl as an alloy Mott insulator, where the alloy sites with changed orbital energies are induced electrostatically by the intercalants. Additional disorder at the alloy sites is discussed as possible reason for the observed peculiar soft gap behavior at higher doping levels.
Source:	arXiv, 0905.1381
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