What is it about?
The closure of the Mott-Hubbard gap is discussed, i.e., the gap is filled with additional electronic states extending down to the far-infrared range. The gap closure coincides with a structural phase transition.
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Why is it important?
The results of pressure-dependent transmittance measurements on TiOBr at low temperatures reveal similar effects at 23 K, where the compound is in the spin-Peierls phase at ambient pressure.
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This page is a summary of: Mott-Hubbard gap closure and structural phase transition in the oxyhalides TiOBr and TiOCl under pressure, Physical Review B, July 2008, American Physical Society (APS),
DOI: 10.1103/physrevb.78.035106.
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