VO2: a two-fluid incoherent metal?

Abstract

We present {\it ab initio} LDA+DMFT results for the many-particle density of states of $V{O}_2$ on the metallic side of the strongly first-order ($T$-driven) insulator-metal transition. In strong contrast to LDA predictions, there is {\it no} remnant of even correlated Fermi liquid behavior in the correlated metal. Excellent quantitative agreement with published photoemission and X-ray absorption experiments is found in the metallic phase. We argue that the absence of FL-quasiparticles provides a natural explanation for the bad-metallic transport for $T>340K$. Based on this agreement, we propose that the I-M transition in $V{O}_2$ is an orbital-selective Mott transition, and point out the relevance of orbital resolved one-electron and optical spectroscopy to resolve this outstanding issue.

4 pages, 3 figures

References in corpus (6)

• Mott-Hubbard Metal-Insulator Transition in Paramagnetic V_2O_3: a LDA+DMFT(QMC) Study
• Photoemission study of the metal-insulator transition in VO_2/TiO_2(001) : Evidence for strong electron-electron and electron-phonon interaction
• Anisotropy of Mott-Hubbard gap transitions due to spin and orbital ordering in LaVO3 and YVO3
• Orbital Switching and the First-Order Insulator-Metal Transition in Paramagnetic V_2O_3
• Electronic structure of VO2 studied by x-ray photoelectron and x-ray emission spectroscopies
• Orbital Correlations in the Ferromagnetic Half-Metal $CrO_{2}

Cited by in corpus (11)

• Orbital-assisted metal-insulator transition in VO${}_2$
• Electrodynamics of the vanadium oxides VO2 and V2O3
• Half-metallic semiDirac point generated by quantum confinement in TiO${}_2$/VO${}_2$ nanostructures
• Infrared spectroscopy and nano-imaging of the insulator-to-metal transition in vanadium dioxide
• Optical properties of correlated materials -- Generalized Peierls approach and its application to VO2
• Role of electron-electron and electron-phonon interaction effect in the optical conductivity of VO2
• Orbital selective insulator-metal transition in V2O3 under external pressure
• Materials Design using Correlated Oxides: Optical Properties of Vanadium Dioxide
• Optical Properties of Correlated Materials -- or Why Intelligent Windows may look Dirty
• Electronic structure of V${}_4$O${}_7$: charge ordering, metal-insulator transition and magnetism
• Spectral functions for strongly correlated 5f-electrons