Non-Stoner Continuum in the Double Exchange Model

Exact diagonalization studies of the double exchange model indicate the existence of continuum states in the single-spin-flip channel that overlap the magnons at very low energies $\left(\approx {10}^{-2\mathrm{}}\mathrm{eV}\right)$ and extend to high energies $\left(\approx \mathrm{eV}\right)$. This picture differs dramatically from the prevalent view, where there are the magnons, plus the Stoner continuum at the high-energy scale, with nothing in between. The relevance of these new continuum states to inelastic neutron scattering and optical properties is discussed.