Send to

Choose Destination
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.

Author information

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


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.

Supplemental Content

Full text links

Icon for American Physical Society
Loading ...
Support Center