Filling of the Mott–Hubbard gap in the oxyhalides TiOCl and TiOBr induced by external pressure

Titelangaben

Kuntscher, Christine A. ; Ebad-Allah, J. ; Pashkin, A. ; Frank, S. ; Klemm, Matthias ; Horn, Siegfried ; Schönleber, Andreas ; van Smaalen, Sander ; Hanfland, Michael ; Glawion, S. ; Sing, M. ; Claessen, Ralph:
Filling of the Mott–Hubbard gap in the oxyhalides TiOCl and TiOBr induced by external pressure.
In: High Pressure Research. Bd. 29 (2009) Heft 4 . - S. 509-513.
ISSN 1477-2299
DOI: https://doi.org/10.1080/08957950903386334

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Abstract

By pressure-dependent infrared microspectroscopy, we observe the filling of the Mott–Hubbard gap in TiOCl and TiOBr above a critical pressure P c. Concomitant with the gap filling, a structural phase transition occurs at P c. According to our pressure-dependent powder X-ray diffraction data, a mixture of the ambient-pressure orthorhombic Pmmn phase and a dimerized, monoclinic P2₁lm phase exists above P c.