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Phys Rev Lett. 2004 Mar 5;92(9):097202. Epub 2004 Mar 2.

Relevance of cooperative lattice effects and stress fields in phase-separation theories for CMR manganites.

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1
National High Magnetic Field Lab and Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.

Abstract

Previous theoretical investigations of colossal magnetoresistance (CMR) materials explain this effect using a "clustered" state with preformed ferromagnetic islands that rapidly align their moments with increasing external magnetic fields. While qualitatively successful, explicit calculations indicate drastically different typical resistivity values in two- and three-dimensional lattices, contrary to experimental observations. This conceptual bottleneck in the phase-separated CMR scenario is resolved here considering the cooperative nature of the Mn-oxide lattice distortions. This effectively induces power-law correlations in the quenched disorder used in toy models with phase competition. When these effects are incorporated, resistor-network calculations reveal very similar results in two and three dimensions, qualitatively modifying previous scenarios and solving the puzzle.

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