Issue |
EPL
Volume 120, Number 4, November 2017
|
|
---|---|---|
Article Number | 46003 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
DOI | https://doi.org/10.1209/0295-5075/120/46003 | |
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.