Sliding Charge-Density Wave Conductivity in Potassium Molybdenum Bronze

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The monoclinic blue-bronze, K0.30MoO3, is an anisotropic metal that undergoes a charge density wave (CDW)-driven phase transition at 180 K, below which nonlinear current-voltage characteristics are observed. In this paper, we examine the anisotropy of the electric and magnetic properties of K0.30MoO3 and their relationship to observed CDW phenomena. We show that the conductivity is highest along the monoclinic b axis and 10 and 100 times lower in two directions perpendicular to b (in the (2 0 1 plane and perpendicular to these planes, respectively). In the CDW state, the conductivity along the b axis is nonlinear when the applied electric field exceeds a small threshold on the order of 50 mV/cm, but is field-independent in perpendicular directions. A periodic response to a dc bias was observed in one small K0.30MoO3 sample, however, the observation of an NbSe3-like response in K0.30MoO3 may depend on sample size or the quality of the electrical contacts to the sample.



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