J. Phys. IV France 12 (2002) Pr9-297
Photocontrol of a dynamic phase transition in the CDW stateK. Miyano and N. Ogawa
Department of Materials and Devices, Photonic Materials, Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan
A strong photoinduced suppression of the creep to slide dynamic phase transition was discovered in a quasi one-dimensional CDW material, K 0.3MoO 3. It is manifested in hysteretic "photoresistivity", an increase in the resistance by orders of magnitude under the illumination of light of modest intensity. Based on a wide range of measurements, it is concluded that the effect is due to the release of the internal stress by photoexcited jumps of the CDW phase over pinning sites: a phenomenon which can be effective only in a system, in which the thermally excited quasiparticles are negligibly small and hence the `bare' CDW properties emerge.
© EDP Sciences 2002