J. Phys. I France
Volume 2, Numéro 5, May 1992
Page(s) 523 - 528
DOI: 10.1051/jp1:1992163
J. Phys. I France 2 (1992) 523-528

Fluctuating conductivity above the charge density wave transition in K 0.3MoO 3

L. Degiorgi and G. Grüner

Department of Physics and Solid State Science Center, University of California at Los Angeles, Los Angeles CA 90024, U.S.A.

(Received 5 February 1992, accepted 28 February 1992)

We have measured the optical conductivity of K 0.3MoO 3 both above and below the charge density wave transition. We find clear evidence for a collective mode contribution to the optical conductivity $\sigma(\omega)$ and for a gradual opening of a pseudogap at temperatures above the charge density wave transition, but below the mean field transition temperature. We also discuss the parameters which characterize the electrodynamic response in the fluctuation regime.

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