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We give a microscopic derivation of the Clausius-Mossotti relations for ahomogeneous and isotropic magneto-dielectric medium consisting of radiativelybroadened atomic oscillators. To this end the diagram series of electromagneticpropagators is calculated exactly for an infinite bi-cubic lattice ofdielectric and magnetic dipoles for a lattice constant small compared to theresonance wavelength $\lambda$. Modifications of transition frequencies andlinewidth of the elementary oscillators are taken into account in aselfconsistent way by a proper incorporation of the singular self-interactionterms. We show that in radiatively broadened media sufficiently close to thefree-space resonance the real part of the index of refraction approaches thevalue -2 in the limit of $\rho \lambda^3 \gg 1$, where $\rho$ is the numberdensity of scatterers. Since at the same time the imaginary part vanishes as$1/\rho$ local field effects can have important consequences for realizinglow-loss negative index materials.

Local-field effects in radiatively broadened magneto-dielectric media: negative refraction and absorption reduction