2003/11/22 by Sanjeev Kumar, Pinaki Majumdar
Materials Science · Physics and Astronomy · #Electronic and Structural Properties of Oxides #Magnetic and transport properties of perovskites and related materials #Quantum and electron transport phenomena #cond-mat.dis-nn
paper · pdf · doi:10.1209/epl/i2003-10056-8
published as Europhys. Lett. vol 65, 75 (2004) · 7 pages, EPL style, with 4 embedded figs. To appear in Europhys. Lett
arxiv created 2003/11/22 · openalex publication_date 2003/12/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
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.