Effects of Reduced Dimensionality on Spin Dynamics in the Layered Perovskite La{sub 1.4}Sr{sub 1.6}Mn{sub 2}O{sub 7}
Journal Article
·
· Physical Review Letters
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Department of Physics, University of California, Riverside, California 92521 (United States)
- Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden (The Netherlands)
- Joint Research Center for Atomic Technology (JRCAT), Tsukuba 305 (Japan)
- Department of Physics, Columbia University, New York, New York 10027 (United States)
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)
We report zero-field muon spin rotation data in single crystals of La{sub 1.4}Sr {sub 1.6}Mn{sub 2}O{sub 7} for T=5{endash}325 K . The spin-lattice relaxation rate is spatially inhomogeneous below the 3D magnetic transition temperature T{sub C} and anisotropic above T{sub C} . We find evidence against 2D spin ordering or in-plane correlations above T{sub C} . Additionally, the very slow spin fluctuations found below T{sub C} in cubic (3D) perovskites like (La,thinspCa)MnO{sub 3} or (La,thinspSr)MnO{sub 3} , and attributed to relatively small magnetoelastic polarons, are absent in La{sub 1.4}Sr {sub 1.6}Mn{sub 2}O{sub 7} . This suggests that the polaron size in the layered material is significantly larger than in the 3D perovskites. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 643591
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 81; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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