S. Brazovskii, P. Monceau and N. Kirova
J. Phys. IV France 131 (2005) 123-124
Conduction and optical effects in the plastic charge-density wavesN. Ogawa1, K. Miyano2 and S. Brazovskii3
1 Department of Physics, University of California at Irvine, Irvine, CA 92697-4575, USA
2 RCAST, University of Tokyo, Tokyo 153-8904, Japan
3 Laboratoire de Physique Théorique et Modèles Statistiques, CNRS, Bât. 100, Université Paris-Sud, 91405 Orsay Cedex, France
The creep motion of the charge-density wave (CDW) and its modulation through optical excitation in the low-temperature state of K0.3MoO3 are analyzed in terms of a local pinning theory, in which local metastable states created by pinning induced phase dislocations are considered. The nonlinear I-V curve below the sliding threshold field (Vs) can be well reproduced with a numerical calculation, and it is shown that photoexcitation increases the transition probability of phase slips, which promotes the creep motion, and also leads to a relaxation of the phase strain.
© EDP Sciences 2005