Abstract
We report the observation of nonlinear conductivity with a well-defined threshold electric field E T, and frequency dependent ac conductivity, in a novel linear chain compound, (TaSe 4) 2I. The material undergoes a phase transition to a semiconducting phase at T ∼ 260 K, and nonlinear and frequency dependent transport is observed below this temperature. We argue that the material is a new example of collective mode transport provided by a Peierls-Fröhlich charge density wave condensate.
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