Pressure-induced metallization and structural phase transition of the Mott-Hubbard insulator TiOBr
Pressure-induced metallization and structural phase transition of the Mott-Hubbard insulator TiOBr
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DOI：
10.1103/physrevb.76.241101
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发表时间：
2007-10
影响因子：
3.7
通讯作者：
C. Kuntscher;S. Frank;A. Pashkin;H. Hoffmann;A. Schonleber;S. Smaalen;M. Hanfland;S. Glawion;M. Klemm;M. Sing;S. Horn;R. Claessen
中科院分区：
文献类型：
--
作者：
C. Kuntscher;S. Frank;A. Pashkin;H. Hoffmann;A. Schonleber;S. Smaalen;M. Hanfland;S. Glawion;M. Klemm;M. Sing;S. Horn;R. Claessen
我们研究了低维Mott-Hubbard绝缘体TiOBr的压力依赖的光学响应的透射率和反射率的测量在红外和可见光频率范围内。观察到的透射率高于临界压力和反射率的伴随增加的抑制，这表明压力诱导的金属化的TiOBr。TiOBr在高压下的金属相确认的存在下延伸到远红外范围的额外的激发。压力诱导金属化符合结构相变，根据压力下的X-射线粉末衍射实验的结果。
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.