Journal article

Publication year: 2018

Journal: Applied Physics Letters

Volume number: 113

Issue number: 20

ISSN: 0003-6951

eISSN: 1077-3118

Open access status: Green

DOI Link: https://doi.org/10.1063/1.5055296

Publisher: American Institute of Physics

Abstract: 
Systematic spectroscopic ellipsometry investigations have been performed in order to elucidate the asymmetric insulator-to-metal transition in thin VO2 films. The comprehensive analysis of the obtained macroscopic optical response yields a hysteretic behavior, and in particular its asymmetry, when performed in the framework of an anisotropic effective medium approximation taking into account the volume fraction of the metal inclusions as well as their shape. We reveal the microscopic details of the percolation transition, namely that the shape of the metal inclusions goes through several plateaus, as seen in the evolution of the shape factor on both sides of the transition region and resulting in different critical volume fractions at the transition for the heating and cooling cycles. Published by AIP Publishing.

Harvard Citation style: Voloshenko, I., Kuhl, F., Gompf, B., Polity, A., Schnoering, G., Berrier, A., et al. (2018) Microscopic nature of the asymmetric hysteresis in the insulator-metal transition of VO₂ revealed by spectroscopic ellipsometry, Applied Physics Letters, 113(20), Article 201906. https://doi.org/10.1063/1.5055296

APA Citation style: Voloshenko, I., Kuhl, F., Gompf, B., Polity, A., Schnoering, G., Berrier, A., & Dressel, M. (2018). Microscopic nature of the asymmetric hysteresis in the insulator-metal transition of VO₂ revealed by spectroscopic ellipsometry. Applied Physics Letters. 113(20), Article 201906. https://doi.org/10.1063/1.5055296