TY - JOUR
T1 - Evolution of spin-wave excitations in ferromagnetic metallic manganites
AU - Ye, F.
AU - Dai, Pengcheng
AU - Fernandez-Baca, J. A.
AU - Sha, Hao
AU - Lynn, J. W.
AU - Kawano-Furukawa, H.
AU - Tomioka, Y.
AU - Tokura, Y.
AU - Zhang, Jiandi
PY - 2006
Y1 - 2006
N2 - Neutron scattering results are presented for spin-wave excitations of three ferromagnetic metallic A1-x Ax, MnO3 manganites (where A and 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 (J4/J1) 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.
AB - Neutron scattering results are presented for spin-wave excitations of three ferromagnetic metallic A1-x Ax, MnO3 manganites (where A and 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 (J4/J1) 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.
UR - http://www.scopus.com/inward/record.url?scp=33144474537&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.96.047204
DO - 10.1103/PhysRevLett.96.047204
M3 - Article
AN - SCOPUS:33144474537
SN - 0031-9007
VL - 96
JO - Physical Review Letters
JF - Physical Review Letters
IS - 4
M1 - 047204
ER -