Role of electron-electron and electron-phonon interaction effects in the optical conductivity of VO₂

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K. Okazaki,¹ S. Sugai,¹ Y. Muraoka,² and Z. Hiroi²
¹Department of Physics, Nagoya University, Nagoya 464-8602, Japan
²Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan

Received 2 December 2005; revised 24 February 2006; published 17 April 2006

Wehave investigated the charge dynamics of VO₂ by optical reflectivitymeasurements. Optical conductivity clearly shows a metal-insulator transition. In themetallic phase, a broad Drude-like structure is observed. On theother hand, in the insulating phase, a broad peak structurearound 1.3 eV is observed. It is found that this broadstructure observed in the insulating phase shows a temperature dependence.We attribute this to the electron-phonon interaction as in thephotoemission spectra.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.165116
DOI:	10.1103/PhysRevB.73.165116
PACS:	71.30.+h; 71.20.Ps; 71.38.-k; 79.60.-i 71.30.+h Metal–insulator transitions and other electronic transitions 71.20.Ps Electronic structure of other crystalline inorganic compounds excluding metals, alloys, semiconductors and fullerenes 71.38.-k Polarons and electron–phonon interactions 79.60.-i Photoemission and photoelectron spectra (condensed matter) YEAR: 2006
KEYWORDS:	vanadium compounds, strongly correlated electron systems, electron-phonon interactions, optical conductivity, metal-insulator transition, photoemission

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