We derive expressions for the effective nonlinear susceptibility tensors for both the second harmonic generation (SHG) and induced third harmonic generation (THG) of nonlinear composite materials, in which nondilute coated particles with radial dielectric anisotropy are randomly embedded in the...

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...</equationsource></inlineequation><//sub></subscript></subscript></subscript>