Nonlinear transport in <InlineEquation ID="Equ1"> <EquationSource Format="TEX">${\sf \beta}$</EquationSource> </InlineEquation>-Na<Subscript> 0.33</Subscript>V<Subscript> 2</Subscript>O<Subscript> 5</Subscript>

Transport properties of the charge ordering compound β-Na<Subscript>0.33</Subscript>V<Subscript>2</Subscript>O<Subscript>5</Sub script> are studied in the temperature range from 30 K to 300 K using current driven DC conductivity experiments. It is found that below the metal-insulator transition temperature (<InlineEquation ID="Equ2"> <EquationSource Format="TEX">$T_{MI}= 136~K$</EquationSource> </InlineEquation>) this material shows a nonlinear charge density modulation behavior. The observed conductivity is discussed in terms of a classical domain model for charge density modulation transport. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006