Spin diffusion in the double-exchange model at T = infinity

The process of spin diffusion within the double-exchange model is studied o n a Bethe lattice in infinite dimension at T=infinity. In the absence of el ectron hopping, the spin-current correlation function oscillates with a per iod inversely proportional to the Hund's coupling and the spin-diffusion co efficient D vanishes. Electron hopping causes the correlation function to d ecay with time and yields a value for D proportional to the electron bandwi dth.