Fluxes in incommensurate crystals

(Received 21 March 1994, received in final form 11 May 1994, accepted 18 May 1994)

Abstract
The interaction between various fluxes and the motion of incommensurate (1) modulation is treated within a phenomenological approach. Three types of fluxes are considered the polarization current, the conductivity current and the heat flux. It is shown that in the I phase all currents are associated with the motion of the I modulation and thus phenomena qualitatively similar to those well known for the electric current in the charge-density-wave systems (low-frequency- and electric-field-dependent conductivity) are predicted for all the I systems and various fluxes. Some anomalies of the relevant kinetic coefficients near the normal - I transition are also expected. The observability of the predicted phenomena is discussed for 1 dielectrics.