Spin correlations of the magnetoresistive bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}
The authors review the recent neutron and X-ray scattering studies of the 40% hole doped bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}, which exhibits colossal magnetoresistance above the ferromagnetic transition at {Tc} {approximately} 113 K. In the paramagnetic region, static diffuse scattering reveals the existence of correlated charges. However, the good agreement of the in-plane spin correlations with the conventional model for quasi two-dimensional XY magnets indicates that the metal-insulator transition is driven by the growth of magnetic correlations. Across the transition, the competition between antiferromagnetic superexchange and ferromagnetic double exchange, observed as canted correlations between spins in neighboring layers within each bilayer, is strongly reduced, indicating a direct link of the double exchange interaction to the hole mobility.
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- USDOE; National Science Foundation (NSF)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 20015180
- Journal Information:
- International Journal of Modern Physics B, Vol. 13, Issue 29-31; Conference: Second International Conference of New Theories, Discoveries and Applications of Superconductors and Related Materials (New{sup 3}SC-2), Las Vegas, NV (US), 06/01/1999; Other Information: PBD: 20 Dec 1999; ISSN 0217-9792
- Country of Publication:
- United States
- Language:
- English
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