From ferromagnetism to spin-density wave: Magnetism in the two channel periodic Anderson model

Abstract

The magnetic properties of the two-channel periodic Anderson model for uranium ions, comprised of a quadrupolar and a magnetic doublet are investigated through the crossover from the mixed-valent to the stable moment regime using dynamical mean field theory. In the mixed-valent regime ferromagnetism is found for low carrier concentration on a hyper-cubic lattice. The Kondo regime is governed by band magnetism with small effective moments and an ordering vector $\q$ close to the perfect nesting vector. In the stable moment regime nearest neighbour anti-ferromagnetism dominates for less than half band filling and a spin density wave transition for larger than half filling. $T_m$ is governed by the renormalized RKKY energy scale ${\mu }_{eff}^2<X_{\sigma }{>}^2{J}^2{\rho }_0(\mu )$.

4 pages, RevTeX, 3 eps figures

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