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.
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Microscopic nature of the asymmetric hysteresis in the insulator-metal transition of VO2 revealed by spectroscopic ellipsometry
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12 November 2018
Research Article|
November 16 2018
Microscopic nature of the asymmetric hysteresis in the insulator-metal transition of VO2 revealed by spectroscopic ellipsometry

Ievgen Voloshenko;
Ievgen Voloshenko
1
1. Physikalisches Institut, Universität Stuttgart
, Pfaffenwaldring 57, 70550 Stuttgart, Germany
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Florian Kuhl
;
Florian Kuhl
2
I. Physikalisches Institut und Zentrum für Materialforschung (LaMa), Justus Liebig Universität Giessen
, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
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Bruno Gompf;
Bruno Gompf
1
1. Physikalisches Institut, Universität Stuttgart
, Pfaffenwaldring 57, 70550 Stuttgart, Germany
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Angelika Polity
;
Angelika Polity
2
I. Physikalisches Institut und Zentrum für Materialforschung (LaMa), Justus Liebig Universität Giessen
, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
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Gabriel Schnoering
;
Gabriel Schnoering
1
1. Physikalisches Institut, Universität Stuttgart
, Pfaffenwaldring 57, 70550 Stuttgart, Germany
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Audrey Berrier;
Audrey Berrier
1
1. Physikalisches Institut, Universität Stuttgart
, Pfaffenwaldring 57, 70550 Stuttgart, Germany
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Martin Dressel
Martin Dressel
a)
1
1. Physikalisches Institut, Universität Stuttgart
, Pfaffenwaldring 57, 70550 Stuttgart, Germany
a)Author to whom correspondence should be addressed: dressel@pi1.physik.uni-stuttgart.de
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a)Author to whom correspondence should be addressed: dressel@pi1.physik.uni-stuttgart.de
Appl. Phys. Lett. 113, 201906 (2018)
Article history
Received:
September 07 2018
Accepted:
October 12 2018
Connected Content
A companion article has been published:
Structure of metallic inclusions in vanadium dioxide influences its insulator-to-metal transition
Citation
Ievgen Voloshenko, Florian Kuhl, Bruno Gompf, Angelika Polity, Gabriel Schnoering, Audrey Berrier, Martin Dressel; Microscopic nature of the asymmetric hysteresis in the insulator-metal transition of VO2 revealed by spectroscopic ellipsometry. Appl. Phys. Lett. 12 November 2018; 113 (20): 201906. https://doi.org/10.1063/1.5055296
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