Observation of a uniform temperature dependence in the electrical resistance across the structural phase transition in thin film vanadium oxide ($VO_{2}$)

TL;DR

This study reveals a consistent temperature dependence of electrical resistance in thin VO₂ films across the structural phase transition, with hysteresis effects linked to granular network transport.

Contribution

It demonstrates a uniform temperature dependence of resistance across the phase transition and attributes hysteresis to granular network effects.

Findings

Resistance follows log(R) ∝ -T over 20-80°C.

Hysteresis observed in resistance during thermal cycling.

Transport behavior attributed to granular network effects.

Abstract

An electrical study of thin $VO_{2}$ films in the vicinity of the structural phase transition at $68^{0}C$ shows (a) that the electrical resistance $R$ follows $log (R)$ $\propto$ $-T$ over the $T$-range, $20 < T < 80 ^{0}C$ covering both sides of the structural transition, and (b) a history dependent hysteresis loop in $R$ upon thermal cycling. These features are attributed here to transport through a granular network.