Evolution of Spin-Wave Excitations in Ferromagnetic Metallic Manganites
- Center for Neutron Scattering, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
- Department of Physics, Florida International University, Miami, Florida 33199 (United States)
- NIST Center for Neutron Research, Gaithersburg, Maryland 20899 (United States)
- Department of Physics, Ochanomizu University, Bunkyo-ku, Tokyo 112-8610 (Japan)
- Correlated Electron Research Center (CERC), Tsukuba 305-0046 (Japan)
Neutron scattering results are presented for spin-wave excitations of three ferromagnetic metallic A{sub 1-x}A{sub x}{sup '}MnO{sub 3} manganites (where A and A{sup '} are rare- and alkaline-earth-metal ions), which when combined with previous work elucidate the systematics of the interactions as a function of carrier concentration x, on-site disorder, and strength of the lattice distortion. The long-wavelength spin dynamics show only a very weak dependence across the series. The ratio of fourth to first neighbor exchange (J{sub 4}/J{sub 1}) that controls the zone boundary magnon softening changes systematically with x, but does not depend on the other parameters. None of the prevailing models can account for these behaviors.
- OSTI ID:
- 20778549
- Journal Information:
- Physical Review Letters, Vol. 96, Issue 4; Other Information: DOI: 10.1103/PhysRevLett.96.047204; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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