Magnon damping by magnon-phonon coupling in manganese perovskites
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)
- Department of Physics, Florida International University, University Park, Miami, Florida 33199 (United States)
- Oak Ridge Natinal Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
- Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 8562, (Japan)
Inelastic neutron scattering was used to systematically investigate the spin-wave excitations (magnons) in ferromagnetic manganese perovskites. In spite of the large differences in the Curie temperatures (T{sub C}'s) of different manganites, their low-temperature spin waves have very similar dispersions with the zone-boundary magnon softening and broadening that cannot be explained by the canonical double exchange mechanism. From the wave-vector dependence of the magnon lifetime effects and its correlation with the dispersions of the optical-phonon modes, we argue that a strong magnetoelastic (magnon-phonon) coupling is responsible for the observed low-temperature anomalous spin dynamical behavior of the manganites. (c) 2000 The American Physical Society.
- OSTI ID:
- 20215835
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 61, Issue 14; Other Information: PBD: 1 Apr 2000; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
Similar Records
Softening and Broadening of the Zone Boundary Magnons in Pr{sub 0.63}Sr{sub 0.37}MnO{sub 3}
Gapless Dirac magnons in CrCl3