Abstract
The mobility of a hole in a narrow s -band is investigated for a simple model with a strong repulsive potential which acts only when two electrons are at the same atomic site. For simplicity it is assumed that k T ≫ Δ ( Δ =bandwidth) and that N h ≪ N , where N and N h are the total number of lattice sites and that of holes respectively. The conductivity is expressed in terms of the current correlation function, which is calculated using the moment method. The moments are evaluated with the aid of diagrammatic representations. The dependence of the hole mobility on the spin ordering is obtained. If all the electron spins are aligned in parallel, the hole mobility is infinite, but the disorder of spin orientations perturbs the motion of the hole. Conversely, if a partial orientations perturbs the motion of the hole. Conversely, if a partial orientation is induced for the spins which are initially in a disordered state, for instance, by an external magnetic field, the hole mobility may be increased. This is ...
Published Version
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