Phys. Rev. Lett. 86, 135–138 (2001)Resistivity of Mixed-Phase ManganitesReceived 26 July 2000; published in the issue dated 1 January 2001 The resistivity ρdc of manganites is studied using a random resistor-network, based on phase separation between metallic and insulating domains. When percolation occurs, both as chemical composition or temperature vary, results in good agreement with experiments are obtained. Similar conclusions are reached using quantum calculations and microscopic considerations. Above the Curie temperature, it is argued that ferromagnetic clusters should exist in Mn oxides. Small magnetic fields induce large ρdc changes and a bad-metal state with (disconnected) insulating domains. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.135
DOI:
10.1103/PhysRevLett.86.135
PACS:
71.10.-w, 75.10.-b, 75.30.Kz
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