Some aspects of the theory of magnets with competing double exchange and superexchange interactions
- The James Franck Institute, The University of Chicago, 5640 S. Ellis Avenue, Chicago, Illinois 60637 (United States)
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439 (United States)
In colossal magnetoresistance materials, ferromagnetic double exchange presumably coexists with a direct nearest-neighbor antiferromagnetic interaction. We construct a single-site mean-field theory that explicitly takes into account the different nature of carrier-mediated ferromagnetism vs Heisenberg-like superexchange. We find, in contrast to previous results in the literature, that the competition between these two exchange interactions leads to ferromagnetic or antiferromagnetic order with incomplete saturation of the magnetization (or sublattice magnetization), rather than spin canting. The associated experimental implications are discussed. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 659327
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 58; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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