Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session C45: Metal Insulator Transitions: VO2, Vanadates, and Nickelates
2:30 PM–5:18 PM,
Monday, March 5, 2018
LACC
Room: 505
Sponsoring
Unit:
DCMP
Chair: Ivan Schuller, Univ of California - San Diego
Abstract ID: BAPS.2018.MAR.C45.8
Abstract: C45.00008 : Resistive asymmetry in the metal-insulator transition of VO2 and V2O3 nanowires*
3:54 PM–4:06 PM
Presenter:
Ivan Schuller
(Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego)
Authors:
Ivan Schuller
(Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego)
Javier Del Valle Granda
(Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego)
Nareg Ghazikhanian
(Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego)
Yoav Kalcheim
(Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego)
Juan Trastoy
(Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego)
Minhan Lee
(Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego)
Marcelo Rozenberg
(Laboratoire de Physique des Solides, CNRS/Universite Paris-Sud)
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.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.C45.8
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