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A theoretical study of the electronic properties of metallic VO₂
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Altanhan, Tacettin (1977) A theoretical study of the electronic properties of metallic VO₂. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b1748582~S15
Abstract
One-electron dispersion relations are obtained in the tight-binding approximation for the two bands d₁₁ and ɳ* which are generally considered to be involved in the metallic conduction which characterizes high temperature rutile phase of V0₂. An upper limit on the Coulomb potential energy associated with on-site (intra-cationic) correlations between electrons of antiparallel spins is calculated. The dispersion relations are used to calculate the average energy associated with the delocalised band states; this energy is compared with that of the corresponding Mott-insulating state in which the d-electrons are localised, one per cation, and it is found that the metallic phase is stable against Mott-insulation.
In spite of the existence of strong electron-optical polar phonon interaction, the formation of a degenerate gas of lattice polarons is ruled out in metallic V0₂; the possibility of electronic polaron formation is examined, and is also found to be suppressed by screening effects.
As an application of the energy dispersion relations the electronic specific heat, the plasma frequency and the Hall coefficient are calculated, and found to be in fairly good agreement with experiment.
| Item Type: | Thesis (PhD) | ||||
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| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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| Library of Congress Subject Headings (LCSH): | Vanadium oxide, Electrons, Metallic oxides | ||||
| Official Date: | August 1977 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | Department of Physics | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Hyland, G. J. (Gerard Joseph) | ||||
| Sponsors: | Türkiye Büyük Millet Meclisi ; British Council | ||||
| Extent: | 121 leaves : illustrations | ||||
| Language: | eng |
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