Observation of First-Order Metal-Insulator Transition without Structural Phase Transition in VO_2

Yong-Sik Lim; Hyun-Tak Kim; B. G. Chae; D. H. Youn; K. O. Kim; K. Y. Kang; S. J. Lee; K. Kim

doi:10.1063/1.1941478

Observation of First-Order Metal-Insulator Transition without Structural Phase Transition in VO_2

Strongly Correlated Electrons 2015-06-24 v2

Authors: Yong-Sik Lim , Hyun-Tak Kim , B. G. Chae , D. H. Youn , K. O. Kim , K. Y. Kang , S. J. Lee , K. Kim

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Abstract

An abrupt first-order metal-insulator transition (MIT) without structural phase transition is first observed by current-voltage measurements and micro-Raman scattering experiments, when a DC electric field is applied to a Mott insulator VO_2 based two-terminal device. An abrupt current jump is measured at a critical electric field. The Raman-shift frequency and the bandwidth of the most predominant Raman-active A_g mode, excited by the electric field, do not change through the abrupt MIT, while, they, excited by temperature, pronouncedly soften and damp (structural MIT), respectively. This structural MIT is found to occur secondarily.

Keywords

metal-insulator transition VO2 Raman scattering electric field structural phase transition

Cite

@article{arxiv.cond-mat/0402485,
  title  = {Observation of First-Order Metal-Insulator Transition without Structural Phase Transition in VO_2},
  author = {Yong-Sik Lim and Hyun-Tak Kim and B. G. Chae and D. H. Youn and K. O. Kim and K. Y. Kang and S. J. Lee and K. Kim},
  journal= {arXiv preprint arXiv:cond-mat/0402485},
  year   = {2015}
}

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4 pages, 4 figures

Observation of First-Order Metal-Insulator Transition without Structural Phase Transition in VO_2

Abstract

Keywords

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