Abstract
Abstract Low-dimensional S = 1 2 systems of the form TiO X ( X = Cl , Br ) have been investigated using photoemission spectroscopy. In their pristine form they display unusual spin-Peierls phases and their behavior under pressure suggests a possible metallic phase. While upon electron-doping photoemission spectra reveal the filling of the upper Hubbard band, clear spectroscopic evidence for a metal–insulator transition is difficult due to correlation and coupling effects in these compounds. However, these effects qualify them as almost ideal model systems for the study of strong electron correlations away from half-filling.
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