Hall effect of sliding condensate in NbSe3

Hall measurements in the non-Ohmic regime show that ${\sigma }_{\mathrm{xy}}$ is independent of electric field $E$ up to the uncertainty of the data (4%). The physical picture that emerges is one of highly mobile current-carrying excitations moving parallel to the chains with a mobility anisotropy of at least ${10}^3$. The Fröhlich sliding model is consistent with the data. On the other hand, models which ascribe the non-Ohmicity to $E$-field generation of free carriers or to hot-electron effects are decisively excluded by the data.