Unusual magnetic behavior of vanadium dioxide: NMR 51V study

Boyarsky, Leonid A.; Gabuda, S. P.; Kozlova, S. G.

doi:10.1016/s0921-4526(99)02697-6

Cited by 5 publications

(2 citation statements)

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“…By accurately fitting the observed asymmetric 51 V NMR spectral line of insulating VO 2 with superposition of symmetrical lines of V 3+ and V 5+ , Boyarsky et al 19 suggested that the low temperature phase of VO 2 consists of V 3+ and V 5+ . In our model, it is the high-temperature phase that consists of co-existing V 3+ and V 5+ cations.…”

Section: Discussionmentioning

confidence: 99%

“…However, the failures of common theoretical probes to accurately describe the ground state of VO 2 raises the question if its chemical nature has been correctly captured in the experimental studies. Interestingly, in a prior study, Boyarsky et al 19 noted that the asymmetric 51 V nuclear magnetic resonance (NMR) spectral line of insulating VO 2 can be accurately fitted with the superposition of symmetrical lines of V 3+ and V 5+ , and therefore, suggested that the transition from metallic to insulating ground state involves the transition with the ground state composed of V 3+ and V 5+ ions. However, a subsequent study by Neilsen et al .…”

Section: Introductionmentioning

confidence: 99%

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Effects of charge fluctuation and charge regulation on the phase transitions in stoichiometric VO2

Joshi

Smieszek

Chakrapani

2020

Sci Rep

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Detailed electrical and photoemission studies were carried out to probe the chemical nature of the insulating ground state of VO2, whose properties have been an issue for accurate prediction by common theoretical probes. The effects of a systematic modulation of oxygen over-stoichiometry of VO2 from 1.86 to 2.44 on the band structure and insulator–metal transitions are presented for the first time. Results offer a different perspective on the temperature- and doping-induced IMT process. They suggest that charge fluctuation in the metallic phase of intrinsic VO2 results in the formation of e− and h+ pairs that lead to delocalized polaronic V3+ and V5+ cation states. The metal-to-insulator transition is linked to the cooperative effects of changes in the V–O bond length, localization of V3+ electrons at V5+ sites, which results in the formation of V4+–V4+ dimers, and removal of $$\pi^{*}$$ π ∗ screening electrons. It is shown that the nature of phase transitions is linked to the lattice V3+/V5+ concentrations of stoichiometric VO2 and that electronic transitions are regulated by the interplay between charge fluctuation, charge redistribution, and structural transition.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%