Ginzburg-Landau theory of metal-insulator transition in VO2: The electronic degrees of freedom

Yin Shi, Fei Xue, Long Qing Chen

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Abstract

VO2 is a well-known strongly correlated system which exhibits an intriguing metal-insulator transition slightly above room temperature. Based on symmetry consideration, we propose a phenomenological Ginzburg-Landau potential incorporating both a structural order parameter and a spin-correlation order parameter, to explicitly capture the structural distortion and the electronic phase transition in VO2. With the help of the additional spin-correlation order parameter, we calculate consistently temperature-stress (strain) phase diagrams of VO2 under different mechanical boundary conditions, which show good agreement with existing experimental observations. The phenomenological potential is suitable for the implementation in phase-field simulations to further investigate the stable phases, morphology and evolution of domain structures under various mechanical and electrical stimuli.

Original languageEnglish (US)
Article number46003
JournalEPL
Volume120
Issue number4
DOIs
StatePublished - Nov 2017

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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