Magnetic-field-induced insulator-metal transition in W-doped VO2 at 500 T

Abstract

Metal-insulator (MI) transitions in correlated electron systems have long been a central and controversial issue in material science. Vanadium dioxide (VO2) exhibits a first-order MI transition at 340 K. For more than half a century, it has been debated whether electronic correlation or the structural instability due to dimerised V ions is the more essential driving force behind this MI transition. Here, we show that an ultrahigh magnetic field of 500 T renders the insulator phase of tungsten (W)-doped VO2 metallic. The spin Zeeman effect on the d electrons of the V ions dissociates the dimers in the insulating phase, resulting in the delocalisation of electrons. Because the Mott-Hubbard gap essentially does not depend on the spin degree of freedom, the structural instability is likely to be the more essential driving force behind the MI transition.

9 pages, 9 figures (including the supplementary information)

References in corpus (5)

• Mott transition in VO2 revealed by infrared spectroscopy and nano-imaging
• Role of electron-electron and electron-phonon interaction effect in the optical conductivity of VO2
• Unraveling the Mott-Peierls intrigue in Vanadium dioxide
• The insulating phases of vanadium dioxide are Mott-Hubbard insulators
• Covalent bonding and hybridization effects in the corundum-type transition-metal oxides V2O3 and Ti2O3

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• Current-induced successive structural phase transitions beyond thermal equilibrium in single-crystal VO2