Mott-Hubbard gap closure and structural phase transition in the oxyhalides TiOBr and TiOCl under pressure

C. A. Kuntscher, A. Pashkin, H. Hoffmann, S. Frank, M. Klemm, S. Horn, A. Schönleber, S. van Smaalen, M. Hanfland, S. Glawion, M. Sing, R. Claessen
  • Physical Review B, July 2008, American Physical Society (APS)
  • DOI: 10.1103/physrevb.78.035106

Phase transition in the oxyhalides TiOBr and TiOCl under pressure

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.

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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http://dx.doi.org/10.1103/physrevb.78.035106

The following have contributed to this page: Priv.-Doz. Dr. Andreas Schönleber