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.

arXiv comment9 pages, 9 figures (including the supplementary information)

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• Unraveling the Mott-Peierls intrigue in Vanadium dioxide
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• Atomic origin for hydrogenation promoted bulk oxygen vacancies removal in vanadium dioxide
• Generating 77 T using a portable pulse magnet for single shot quantum beam experiments
• Linear Trimer Formation by Three-Center-Four-Electron Bonding in RuP
• High-strain-induced local modification of the electronic properties of VO${}_2$ thin films
• Inducing a metal-insulator transition in disordered interacting Dirac fermion systems via an external magnetic field
• Single shot x-ray diffractometry in SACLA with pulsed magnetic fields up to 16 T
• Higher magnetic-field generation by a mass-loaded single-turn coil
• Quantized Hall conductance in graphene by nonperturbative magnetic-field-containing relativistic tight-binding approximation method
• Orbital Magnetic Field Driven Metal-Insulator Transition in Strongly Correlated Electron Systems
• Magnetic field induced valence change in Eu(Co${}_{1-x}$Ni${}_x$)${}_2$P${}_2$ up to 60 T
• Magnetic-field effect on excitonic condensation emergent in extended Falicov-Kimball model
• Topological spin-up triplet excitonic condensation in two-dimensional electron-hole systems
• Current-induced successive structural phase transitions beyond thermal equilibrium in single-crystal VO2