Anti-Localisation to Strong Localisation: The Interplay of Magnetic Scattering and Structural Disorder

Abstract

We study the effect of magnetic scattering on transport in a system with strong structural disorder, using exact finite size calculation of the low frequency optical conductivity. At weak electron-spin coupling spin disorder leads to a decrease in resistivity by weakening the quantum interference precursors to Anderson localisation. However, at strong electron-spin coupling, the double exchange limit, magnetic scattering increases the effective disorder, sharply increasing the resistivity. We illustrate the several unusual transport regimes in this strong disorder problem, identify a re-entrant insulator-metal-insulator transition, and map out the phase diagram at a generic electron density.

arXiv comment7 pages, EPL style, with 4 embedded figs. To appear in Europhys. Lett

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• Impact of Next-Nearest-Neighbor hopping on Ferromagnetism in Diluted Magnetic Semiconductors
• Dimensional and temperature dependence of metal insulator transition in correlated and disordered systems
• Collapse of ferromagnetism with Ti doping in Sm${}_{0.55}$Sr${}_{0.45}$MnO${}_3$: A combined experimental and theoretical study
• Decoherence induced by magnetic impurities in quantum Hall system