Softening of the insulating phase near Tc for the photo-induced insulator-to-metal phase transition in vanadium dioxide

Details Softening of the insulating phase near Tc for the photo-induced insulator-to-metal phase transition in vanadium dioxide Softening of the insulating phase near Tc for the photo-induced insulator-to-metal phase transition in vanadium dioxide

2007-07-06

arxiv.org/abs/0707.1054v2

Physics

Condensed Matter

Strongly Correlated Electrons

accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.100.019906

We use optical-pump terahertz-probe spectroscopy to investigate the near-threshold behavior of the photoinduced insulator-to-metal (IM) transition in vanadium dioxide thin films. Upon approaching Tc a reduction in the fluence required to drive the IM transition is observed, consistent with a softening of the insulating state due to an increasing metallic volume fraction (below the percolation limit). This phase coexistence facilitates the growth of a homogeneous metallic conducting phase following superheating via photoexcitation. A simple dynamic model using Bruggeman effective medium theory describes the observed initial condition sensitivity.

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