Abstract
The compound Tl 2Mn 2O 7 exhibits colossal magneto resistance, which is not adequately explained by the double exchange mechanism. We use Hubbard operators to reformulate a previous model of Ventura and Alascio (Phys. Rev. B 56 (1997) 14533), and we obtain approximate one-electron Green's functions (GF) for this model, using a method introduced by Foglio and Figueira (Phys. Rev. B 60 (1999) 11361). With these GF we calculate the static and dynamic conductivity, both with and without applied magnetic fields.
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