Resistive asymmetry in the metal-insulator transition of VO<sub>2</sub> and V<sub>2</sub>O<sub>3</sub> nanowires
ORAL
Abstract
VO2 and V2O3 are two examples of correlated oxides featuring a metal-insulator transition (MIT) at 340 K and 160 K, respectively. These transitions have attracted much attention, but few studies have addressed the effect of dimensional confinement.
We have studied the MIT in VO2 and V2O3 nanowires as a function of their width. As it approaches to the characteristic domain size, a clear asymmetry develops in the R vs T curves: when cooling, the resistivity changes in few, large jumps; while it does it in a smooth way when warming.
Similar results have been observed in FeRh nanowires [1] and VO2 nanobeams [2], suggesting that this might be a universal feature of first order phase transitions in 1D systems. However, different mechanisms were invoked to explain this phenomenon, and a universal explanation is still lacking. We show that this effect can be understood simply by considering the transition hysteresis together with the temperature dependence of the gap.
[1] V. Uhlír et al. Nat. Commun. 7, 13113 (2016).
[2] W. Fan et al. Phys. Rev. B 83, 235102 (2011).
We have studied the MIT in VO2 and V2O3 nanowires as a function of their width. As it approaches to the characteristic domain size, a clear asymmetry develops in the R vs T curves: when cooling, the resistivity changes in few, large jumps; while it does it in a smooth way when warming.
Similar results have been observed in FeRh nanowires [1] and VO2 nanobeams [2], suggesting that this might be a universal feature of first order phase transitions in 1D systems. However, different mechanisms were invoked to explain this phenomenon, and a universal explanation is still lacking. We show that this effect can be understood simply by considering the transition hysteresis together with the temperature dependence of the gap.
[1] V. Uhlír et al. Nat. Commun. 7, 13113 (2016).
[2] W. Fan et al. Phys. Rev. B 83, 235102 (2011).
*This research is supported by the Vannevar Bush Faculty Fellowship program, funded by the Office of Naval Research through grant N00014-15-1-2848. J. del Valle and J. Trastoy thank the Fundación Ramón Areces for their support.
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Presenters
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Ivan Schuller
- Department of Physics, Univ of California - San Diego
- University of California, San Diego
- Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego
- UC San Diego
- Department of Physics and Center for Advance Nanoscience, University of California San Diego
- Physics Department and Center for Advanced Nanoscience, University of California San Diego
- Univ of California - San Diego
- Physics, University of California, San Diego