Optical Properties of Heavy Fermion Systems with SDW Order

The dynamical conductivity $\sigma (\omega )$, reflectivity $R(\omega )$, and tunneling density of states $N(\omega )$ of strongly correlated systems (like heavy fermions) with a spin-density wave (SDW) magnetic order are studied as a function of impurity scattering rate and temperature. The theory is generalized to include strong coupling effects in the SDW order. The results are discussed in the light of optical experiments on heavy-fermion SDW materials. With some modifications the proposed theory is applicable also to heavy fermions with localized antiferromagnetic (LAF) order.