Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-08-22
Physics
Condensed Matter
Strongly Correlated Electrons
RevTeX 4, 4 figures
Scientific paper
10.1103/PhysRevLett.92.097202
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 induces power-law correlations in the quenched random fields used in toy models with phase competition. When these effects are incorporated, resistor-network calculations reveal very similar results in two and three dimensions, solving the puzzle.
Burgy Jan
Dagotto Elbio
Moreo Adriana
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