Abstract
Magnon excitation in a ferromagnetic state of Sm{sub 0.55}Sr{sub 0.45}MnO{sub 3} located on the verge of the metal-insulator transition has been studied in terms of the neutron scattering experiment. The anomalous magnon dispersion with the zone-boundary softening is well described by the Heisenberg model with extended exchange coupling constants Js. In particular the fourth neighbor coupling J{sub 4} is as large as 0.6 times the nearest neighbor one J{sub 1}. Theoretical analysis based on the local density approximation + Hubbard U band calculation reveals that this one-dimensional exchange path is due to the (3z{sup 2}-r{sup 2})-type orbital correlation, in sharp contrast to previous proposals.
Endoh, Y;
[1]
International Institute of Advanced Studies, Kizugawa-dai, Kizucho, Kyoto, 619-0225 (Japan)];
Hiraka, H;
[1]
Tomioka, Y;
[2]
Tokura, Y;
[2]
Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)];
Nagaosa, N;
[2]
CREST, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)];
Fujiwara, T
[3]
- Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577 (Japan)
- Correlated Electron Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8562 (Japan)
- Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)
Citation Formats
Endoh, Y, International Institute of Advanced Studies, Kizugawa-dai, Kizucho, Kyoto, 619-0225 (Japan)], Hiraka, H, Tomioka, Y, Tokura, Y, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], Nagaosa, N, CREST, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], and Fujiwara, T.
Orbital nature of ferromagnetic magnons in manganites.
United States: N. p.,
2005.
Web.
doi:10.1103/PhysRevLett.94.017206.
Endoh, Y, International Institute of Advanced Studies, Kizugawa-dai, Kizucho, Kyoto, 619-0225 (Japan)], Hiraka, H, Tomioka, Y, Tokura, Y, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], Nagaosa, N, CREST, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], & Fujiwara, T.
Orbital nature of ferromagnetic magnons in manganites.
United States.
https://doi.org/10.1103/PhysRevLett.94.017206
Endoh, Y, International Institute of Advanced Studies, Kizugawa-dai, Kizucho, Kyoto, 619-0225 (Japan)], Hiraka, H, Tomioka, Y, Tokura, Y, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], Nagaosa, N, CREST, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], and Fujiwara, T.
2005.
"Orbital nature of ferromagnetic magnons in manganites."
United States.
https://doi.org/10.1103/PhysRevLett.94.017206.
@misc{etde_20621646,
title = {Orbital nature of ferromagnetic magnons in manganites}
author = {Endoh, Y, International Institute of Advanced Studies, Kizugawa-dai, Kizucho, Kyoto, 619-0225 (Japan)], Hiraka, H, Tomioka, Y, Tokura, Y, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], Nagaosa, N, CREST, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], and Fujiwara, T}
abstractNote = {Magnon excitation in a ferromagnetic state of Sm{sub 0.55}Sr{sub 0.45}MnO{sub 3} located on the verge of the metal-insulator transition has been studied in terms of the neutron scattering experiment. The anomalous magnon dispersion with the zone-boundary softening is well described by the Heisenberg model with extended exchange coupling constants Js. In particular the fourth neighbor coupling J{sub 4} is as large as 0.6 times the nearest neighbor one J{sub 1}. Theoretical analysis based on the local density approximation + Hubbard U band calculation reveals that this one-dimensional exchange path is due to the (3z{sup 2}-r{sup 2})-type orbital correlation, in sharp contrast to previous proposals.}
doi = {10.1103/PhysRevLett.94.017206}
journal = []
issue = {1}
volume = {94}
journal type = {AC}
place = {United States}
year = {2005}
month = {Jan}
}
title = {Orbital nature of ferromagnetic magnons in manganites}
author = {Endoh, Y, International Institute of Advanced Studies, Kizugawa-dai, Kizucho, Kyoto, 619-0225 (Japan)], Hiraka, H, Tomioka, Y, Tokura, Y, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], Nagaosa, N, CREST, Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656 (Japan)], and Fujiwara, T}
abstractNote = {Magnon excitation in a ferromagnetic state of Sm{sub 0.55}Sr{sub 0.45}MnO{sub 3} located on the verge of the metal-insulator transition has been studied in terms of the neutron scattering experiment. The anomalous magnon dispersion with the zone-boundary softening is well described by the Heisenberg model with extended exchange coupling constants Js. In particular the fourth neighbor coupling J{sub 4} is as large as 0.6 times the nearest neighbor one J{sub 1}. Theoretical analysis based on the local density approximation + Hubbard U band calculation reveals that this one-dimensional exchange path is due to the (3z{sup 2}-r{sup 2})-type orbital correlation, in sharp contrast to previous proposals.}
doi = {10.1103/PhysRevLett.94.017206}
journal = []
issue = {1}
volume = {94}
journal type = {AC}
place = {United States}
year = {2005}
month = {Jan}
}