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Pressure-induced metallization and structural phase transition of the Mott-Hubbard insulator TiOBr

C. A. Kuntscher, S. Frank, A. Pashkin, H. Hoffmann, A. Schönleber, S. van Smaalen, M. Hanfland, S. Glawion, M. Klemm, M. Sing, S. Horn, and R. Claessen
Phys. Rev. B 76, 241101(R) – Published 7 December 2007

Abstract

We investigated the pressure-dependent optical response of the low-dimensional Mott-Hubbard insulator TiOBr by transmittance and reflectance measurements in the infrared and visible frequency range. A suppression of the transmittance above a critical pressure and a concomitant increase of the reflectance are observed, suggesting a pressure-induced metallization of TiOBr. The metallic phase of TiOBr at high pressure is confirmed by the presence of additional excitations extending down to the far-infrared range. The pressure-induced metallization coincides with a structural phase transition, according to the results of x-ray powder diffraction experiments under pressure.

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  • Received 22 October 2007

DOI:https://doi.org/10.1103/PhysRevB.76.241101

©2007 American Physical Society

Authors & Affiliations

C. A. Kuntscher1,*, S. Frank1, A. Pashkin1, H. Hoffmann1, A. Schönleber2, S. van Smaalen2, M. Hanfland3, S. Glawion4, M. Klemm1, M. Sing4, S. Horn1, and R. Claessen4

  • 1Experimentalphysik 2, Universität Augsburg, D-86135 Augsburg, Germany
  • 2Laboratory of Crystallography, Universität Bayreuth, 95440 Bayreuth, Germany
  • 3European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
  • 4Experimentelle Physik 4, Universität Würzburg, D-97074 Würzburg, Germany

  • *christine.kuntscher@physik.uni-augsburg.de

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Vol. 76, Iss. 24 — 15 December 2007

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