local $f$-moments are polarized. When the moments are aligned, the $p$-holes can move essentially freely in the ferromagnetic background without breaking the singlet state with the localized spins. Therefore the source of scattering disappears and the metallic state recovers the Fermi-liquid coherence. In other words the polarization of $f$-orbital local moments allows the conduction electron cloud to dynamically screen the correlated electrons local moments, dramatically increasing the coherence scale of the system.

The coherent motion of the doped carriers with the opposite spin of the localized momenta (majority spin) should then be balanced by the insulating nature of the minority spins carriers. This effect is illustrated in the . In this figure we show the behavior of both spin species conduction electrons Green’s function for the same strengths of the external magnetic field as used in . Left panel shows the increasing metalization of the majority spin charge carriers, whereas in the right panel we show how minority spins are driven towards an insulating state by increasing magnetic field.

![(Color online) Imaginary part of the majority-spin $p$-electron self-energy for increasing external magnetic field $\mathbf{B}$. The data are from QMC solution at $T=0.016$ and $\d=0.05$. []{data-label="fig3.1"}](fig11.eps){width="45.00000%"}

![Imaginary part of conduction band 