Relevance of Cooperative Lattice Effects and Stress Fields in Phase-Separation Theories for CMR Manganites

Jan Burgy, Adriana Moreo, and Elbio Dagotto
Phys. Rev. Lett. 92, 097202 – Published 2 March 2004

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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  • Received 26 June 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.097202

©2004 American Physical Society

Authors & Affiliations

Jan Burgy, Adriana Moreo, and Elbio Dagotto

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

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Issue

Vol. 92, Iss. 9 — 5 March 2004

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