Large kinetic asymmetry in the metal-insulator transition nucleated at localized and extended defects

Fan, Wen; Cao, Jin Xin; Seidel, Jan; Gu, Yijia; Yim, Joanne W. L.; Barrett, Christopher D.; Yu, K. M.; Ji, J.; Ramesh, R.; Chen, Lei; Wu, Junqiao

doi:10.1103/physrevb.83.235102

Cited by 97 publications

(103 citation statements)

References 31 publications

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“…Comparing to the value for the heating stage, a bigger f(H) of cooling stage means lacking of proper nucleation sites, resulting in a large kinetic asymmetry of the transition. It is consistent with previous report [34]. Extended twin walls serve as a catalyst to nucleate the metal phase and thus effectively eliminate superheating, whereas such a benefit is absent in undercooling.…”

Section: Resultssupporting

confidence: 93%

Thermal kinetic analysis of metal–insulator transition mechanism in W-doped VO2

Zhang

Chen

et al. 2016

J Therm Anal Calorim

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Tungsten (W) doping can decrease the phase transition temperature of VO 2 , but underlining reasons are not clear. In this study, differential scanning calorimetry was employed to investigate the kinetics of the solid-solid transition in hydrothermal-synthesized W (X = 0.50, 1.09, 2.58 and 3.81 %)-doped VO 2 nanoparticles. We firstly revealed the W-doping mechanism by combining the classical nucleation kinetics model with isoconversional kinetic analysis and applied them on the solid-solid transition taking place in doping. The experimentally observed large lag in the cooling stage and asymmetry effects of the decreasing temperature on insulator-metal transition and metal-insulator transition can be rationally explained. In the heating stage, W doping decreases free energy barrier (DG*) for homogenous nucleation and reduces geometrical factor (f(H)) and both factors promote the transition and thus lower the phase transition temperature quickly. However, in cooling stage, the free energy barrier (DG het * ) for heterogeneous nucleation was much larger than that of heating stage due to lacking of proper nucleation sites. The effect of decreasing geometrical factor was accompanied with the effect of increasing free energy barrier for homogenous nucleation by doping W. Such a competition mechanism slows down the trend of reducing temperature. It is important to unravel interaction mechanisms of doped W on different VO 2 phases, which is helpful to further tailor kinetic properties of VO 2 phase transition.

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Section: Resultssupporting

confidence: 93%

Thermal kinetic analysis of metal–insulator transition mechanism in W-doped VO2

Zhang

Chen

et al. 2016

J Therm Anal Calorim

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“…[12] However, there was a report on various simulated parameters, E ij, for single crystal VO 2 . [13] The epitaxial strains were calculated from…”

Section: Epitaxial Strains and Stressesmentioning

confidence: 99%

Large epitaxial bi-axial strain induces a Mott-like phase transition in VO2

Kittiwatanakul

Wolf

2014

Applied Physics Letters

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The metal insulator transition (MIT) in VO 2 has been an important topic for recent years.It has been generally agreed that the mechanism of the MIT in bulk VO 2 is considered to be a collaborative Mott-Peierls transition, however the effect of the strain on the phase transition is much more complicated. In this study the effect of the large strain on the properties of VO 2 films was investigated. One remarkable result is that highly strained epitaxial VO 2 thin films were rutile in the insulating state as well as in the metallic state. These highly strained VO 2 films underwent an electronic phase transition without the concomitant Peierls transition. Our results also show that a very large tensile strain along the c-axis of rutile VO 2 resulted in a phase transition temperature of ~ 433 K, much higher than in any previous report. Our findings elicit that the metal insulator transition in VO 2 can be driven by an electronic transition alone, rather the typical coupled electronic-structural transition.

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“…The bending sequence can be reversibly repeated for both rising and falling temperatures and is characterized by a temperature hysteresis with a width of 20-40°C ( Fig. 5) [12,23]. In the lower section of Fig.…”

Section: Methodsmentioning

confidence: 99%