Volume 120, Number 4, November 2017
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||08 February 2018|
Ginzburg-Landau theory of metal-insulator transition in VO2: The electronic degrees of freedom
Department of Materials Sciences and Engineering, Pennsylvania State University University Park, PA 16802, USA
Received: 15 August 2017
Accepted: 15 January 2018
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.
PACS: 64.60.Ej – Studies/theory of phase transitions of specific substances / 71.30.+h – Metal-insulator transitions and other electronic transitions / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2018
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