ac Dynamics of NbSe3 in the switching regime

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Abstract

We have measured the low-field ac conductivity σ(ω) of switching samples of NbSe3 in the lower charge density wave (CDW) state, over the frequency range 10 Hz to 500 MHz. For zero applied dc bias fields, σ(ω) reflects overdamped response, with no evidence for dominant inertial contributions. For dc bias fields exceeding the threshold ET, a complicated ac conductivity obtains, whose overall features rule out, as valid descriptions of switching, simple classical overdamped center of mass motion, or overdamped motion with excessive current noise. Our results demonstrate the necessity of additional degrees of freedom in describing switching phenomena.

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