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

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arxiv 0710.4126 v1 pith:CNGXMYDB submitted 2007-10-22 cond-mat.str-el

C. A. Kuntscher , S. Frank , A. Pashkin , H. Hoffmann , A. Schönleber , S. van Smaalen , M. Hanfland , S. Glawion
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M. Klemm M. Sing S. Horn R. Claessen
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classification cond-mat.str-el
keywords tiobrmetallizationphasepressurepressure-inducedinsulatormott-hubbardrange
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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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