Magnons in ferromagnetic metallic manganites

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Journal of Physics: Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/19/31/315204· OSTI ID:931825

Zhang, Jiandi ^[1]; Ye, Feng ^[2]; Sha, Hao ^[1]; Dai, Pengcheng ^[2]; Fernandez-Baca, Jaime A ^[2]; Plummer, E Ward ^[2]

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1. Florida International University, Miami
2. ORNL

Ferromagnetic (FM) manganites, a group of likely half-metallic oxides, are of special interest not only because they are a testing ground for the classical double-exchange interaction mechanism for the colossal magnetoresistance, but also because they exhibit an extraordinary arena of emergent phenomena. These emergent phenomena are related to the complexity associated with strong interplay between charge, spin, orbital, and lattice. In this review, we focus on the use of inelastic neutron scattering to study the spin dynamics, mainly the magnon excitations in this class of FM metallic materials. In particular, we discuss the unusual magnon softening and damping near the Brillouin zone boundary in relatively narrow-band compounds with strong Jahn CTeller lattice distortion and charge Corbital correlations. The anomalous behaviours of magnons in these compounds indicate the likelihood of cooperative excitations involving spin and lattice as well as orbital degrees of freedom.

• 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: 931825
• Journal Information: Journal of Physics: Condensed Matter, Journal Name: Journal of Physics: Condensed Matter Vol. 19; ISSN 0953-8984; ISSN JCOMEL
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRILLOUIN ZONES
DAMPING
DEGREES OF FREEDOM
FERROMAGNETIC MATERIALS
FERROMAGNETISM
MAGNETORESISTANCE
MAGNONS
NEUTRONS
OXIDES
SCATTERING
SPIN
TESTING
ferromagnetic manganite
spin wave