Magnons in Ferromagnetic Metallic Manganites

Abstract

Ferromagnetic (FM) manganites, a group of likely half-metallic oxides, are of special interest not only because they are a testing ground of the classical doubleexchange 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 discussed the unusual magnon softening and damping near the Brillouin zone boundary in relatively narrow band compounds with strong Jahn-Teller lattice distortion and charge/orbital correlations. The anomalous behaviors of magnons in these compounds indicate the likelihood of cooperative excitations involving spin, lattice, as well as orbital degrees of freedom.

published in J. Phys.: Cond. Matt. 20 figures

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Cited by in corpus (23)

• Half-metallic ferromagnets: From band structure to many-body effects
• Spin wave resonances in La_{0.7}Sr_{0.3}MnO_{3} films: measurement of spin wave stiffness and anisotropy field
• Spin-wave excitations in the ferromagnetic-metallic and in the charge, orbital and spin ordered states in Nd${}_{1-x}$Sr${}_x$MnO${}_3$ with x$\approx$0.5
• Ground state in a half-doped manganite distinguished by neutron spectroscopy
• Spin-charge coupling in a band ferromagnet: magnon-energy reduction, anomalous softening, and damping
• Polaron-mediated spin correlations in metallic and insulating La${}_{1-x}{A}_x$MnO${}_3$ ($A$=Ca, Sr, or Ba)
• Dynamics of Phase Separated States in the Double Exchange Model
• Orbital fluctuations, spin-orbital coupling, and anomalous magnon softening in an orbitally degenerate ferromagnet
• Spin excitations used to probe the nature of the exchange coupling in the magnetically ordered ground state of Pr${}_{0.5}$Ca${}_{0.5}$MnO${}_3$
• Strength and scales of itinerant spin fluctuations in 3d paramagnetic metals
• Fermionic representation for the ferromagnetic Kondo lattice model -- diagrammatic study of spin-charge coupling effects on magnon excitations
• Spin wave damping arising from phase coexistence below $T_c$ in colossal magnetoresistive La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$
• New Correlated Model of Colossal Magnetoresistive Manganese Oxides
• Paramagnetic Spin Correlations in Colossal Magnetoresistive La0.7Ca0.3MnO3
• Interacting spin waves in the ferromagnetic Kondo lattice model
• Ferromagnetic Excitations in La${}_{0.82}$Sr${}_{0.18}$CoO${}_3$ Observed Using Neutron Inelastic Scattering
• Strongly anharmonic collective modes in a coupled electron-phonon-spin problem
• Spin-charge and spin-orbital coupling effects on spin dynamics in ferromagnetic manganites
• Two-Fluid Behaviour at the Origin of the Resistivity Peak in Doped Manganites
• Magnon self energy in the correlated ferromagnetic Kondo lattice model: spin-charge coupling effects on magnon excitations in manganites
• Phenomenological Model of Longitudinal Spin Fluctuations in Itinerant Antiferromagnets
• Phenomenological model of anomalous magnon softening and damping in half-metallic manganites
• Magnon damping and mode softening in quantum double-exchange ferromagnets