Correlated metallic state of vanadium dioxide

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M. M. Qazilbash,¹ K. S. Burch,¹ D. Whisler,¹ D. Shrekenhamer,¹ B. G. Chae,² H. T. Kim,² and D. N. Basov¹
¹Physics Department, University of California-San Diego, La Jolla, California 92093, USA
²IT Convergence and Components Lab, ETRI, Daejeon 305-350, Korea

Received 1 September 2006; published 22 November 2006

Themetal-insulator transition and unconventional metallic transport in vanadium dioxide (VO₂)are investigated with a combination of spectroscopic ellipsometry and reflectancemeasurements. The data indicate that electronic correlations, not electron-phonon interactions,govern charge dynamics in the metallic state of VO₂. Thisstudy focuses on the frequency and temperature dependence of theconductivity in the regime of extremely short mean free pathviolating the Ioffe-Regel-Mott limit of metallic transport. The standard quasiparticlepicture of charge conduction is found to be untenable inmetallic VO₂.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.205118
DOI:	10.1103/PhysRevB.74.205118
PACS:	71.30.+h; 71.27.+a; 78.20.-e; 78.30.-j 71.30.+h Metal–insulator transitions and other electronic transitions 71.27.+a Strongly correlated electron systems; heavy fermions 78.20.-e Optical properties of bulk materials and thin films 78.30.-j Infrared and Raman spectra (condensed matter) YEAR: 2006
KEYWORDS:	vanadium compounds, metal-insulator transition, reflectivity, electron correlations, quasiparticles

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