Electrodynamics of the vanadium oxides VO2 and V2O3

被引：242

作者：

Qazilbash, M. M. ^{[1
]}

Schafgans, A. A. ^{[1
]}

Burch, K. S. ^{[1
,3
]}

Yun, S. J. ^{[2
]}

Chae, B. G. ^{[2
]}

Kim, B. J. ^{[2
]}

Kim, H. T. ^{[2
]}

Basov, D. N. ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] ETRI, IT Convergence & Components Lab, Taejon 305350, South Korea

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 11期

关键词：

D O I：

10.1103/PhysRevB.77.115121

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The optical and infrared properties of films of vanadium dioxide (VO2) and vanadium sesquioxide (V2O3) have been investigated via ellipsometry and near-normal incidence reflectance measurements from far infrared to ultraviolet frequencies. Significant changes occur in the optical conductivity of both VO2 and V2O3 across the metal-insulator transitions at least up to (and possibly beyond) 6 eV. We argue that such changes in optical conductivity and electronic spectral weight over a broad frequency range are evidence of the important role of electronic correlations to the metal-insulator transitions in both of these vanadium oxides. We observe a sharp optical transition with possible final state (exciton) effects in the insulating phase of VO2. This sharp optical transition occurs between narrow a(1g) bands that arise from the quasi-one-dimensional chains of vanadium dimers. Electronic correlations in the metallic phases of both VO2 and V2O3 lead to reduction of the kinetic energy of the charge carriers compared to band theory values, with paramagnetic metallic V2O3 showing evidence of stronger correlations compared to rutile metallic VO2.

引用

页数：10

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