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TT: Tiefe Temperaturen

TT 31: Correlated Electrons: Metal Insulator Transition - Part 2

TT 31.4: Talk

Thursday, March 30, 2006, 14:45–15:00, HSZ 301

Surface acoustic wave investigations of the metal-to-insulator transition of V₂O₃ thin films — •Claus Müller, Alexei A. Nateprov, Günter Obermeier, Matthias Klemm, Reinhard Tidecks, Achim Wixforth, and Siegfried Horn — Institut für Physik, Universität Augsburg, D-86159, Augsburg, Germany

A sensitive tool to study the lattice and electronic system of thin solid films are surface acoustic waves (SAW) generated on a piezoelectric substrate on which the material of interest is attached. By electron-beam evaporation a V₂O₃ film was deposited onto piezoelectric LiNbO₃. To investigate the metal-to-insulator (MI) transition surface acoustic wave studies were performed in a temperature range from 260K to 10K. The attenuation becomes maximal at the MI-transition and shows a hysteresis not only of electronic nature. The sound velocity change reveals a precursor of the MI-transition of V₂O₃ [1], which can also be detected in the attenuation using a self-retuning SAW delay line.

[1] C. Müller, A. A. Nateprov, G. Obermeier, M. Klemm, R. Tidecks, A. Wixforth, and S. Horn, J. Appl. Phys. 98, 084111 (2005)