Role of joule heating effect and bulk-surface phases in voltage-driven metal-insulator transition in VO2 crystal | Zendy

Bongjin Simon Mun | Zendy; Joonseok Yoon | Zendy; SungKwan Mo | Zendy; Kai Chen | Zendy; Nobumichi Tamura | Zendy; Catherine Dejoie | Zendy; Martin Kunz | Zendy; Zhi Liu | Zendy; ChangWoo Park | Zendy; Kyungsun Moon | Zendy; Honglyoul Ju | Zendy

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Role of joule heating effect and bulk-surface phases in voltage-driven metal-insulator transition in VO2 crystal

Author(s) -

Bongjin Simon Mun,

Joonseok Yoon,

SungKwan Mo,

Kai Chen,

Nobumichi Tamura,

Catherine Dejoie,

Martin Kunz,

Zhi Liu,

ChangWoo Park,

Kyungsun Moon,

Honglyoul Ju

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4817727

Subject(s) - joule heating , materials science , condensed matter physics , metal–insulator transition , phase transition , voltage , electrode , crystal (programming language) , heating element , joule effect , asymmetry , insulator (electricity) , metal , chemistry , optoelectronics , composite material , metallurgy , electrical engineering , physics , quantum mechanics , engineering , computer science , programming language

We report the characteristics of a voltage-induced metal-insulator transition (MIT) in macro-sized VO2 crystals. The square of MIT onset voltage (VCMIT2) value shows a linear dependence with the ambient temperature, suggesting that the Joule heating effect is the likely cause to the voltage-induced MIT. The combination of optical microscope images and Laue microdiffraction patterns show the simultaneous presence of a metallic phase in the bulk of the crystal with partially insulating surface layers even after the MIT occurs. A large asymmetry in the heating power just before and after the MIT reflects the sudden exchange of Joule heat to its environment.

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