Evolution of Spin-Wave Excitations in Ferromagnetic Metallic Manganites

Journal Article · Sat Dec 31 23:00:00 EST 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.047204· OSTI ID:930936

Ye, Feng ^[1]; Dai, Pengcheng ^[1]; Fernandez-Baca, Jaime A ^[1]; Sha, Hao ^[2]; Lynn, J. W. ^[3]; Kawano-Furukawa, H. ^[4]; Tomioka, Y. ^[5]; Tokura, Y. ^[6]; Zhang, Jiandi ^[2]

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1. ORNL
2. Florida International University, Miami
3. National Institute of Standards and Technology (NIST)
4. Ochanomizu University, Japan
5. Correlated Electron Research Center (CERC), Japan
6. University of Tokyo, Tokyo, Japan

Neutron scattering results are presented for spin-wave excitations of three ferromagnetic metallic A1xA0xMnO3 manganites (where A and A0 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.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 930936
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 96
• Country of Publication: United States
• Language: English

Related Subjects

CMR manganite
spin wave