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

Abstract

Inelastic neutron scattering experiments have been performed on single crystals of Nd${}_{1-x}$Sr${}_x$MnO${}_3$ with x$\approx$0.5. Colossal magnetoresistance (CMR) in the manganites arises from the interplay between a ferromagnetic metallic and antiferromagnetic charge and orbital ordered insulating state. Therefore, it appears important to compare these phases concerning their underlying magnetic interaction parameters. Our investigations of the spin-wave disperion in the AFM ordered state of Nd${}_{0.5}$Sr${}_{0.5}$MnO${}_3$ exhibits a strongly anisotropic stiffness. The sign of the anisotropy is characteristic for the site-centered model for charge and orbital ordering in half-doped manganites. Within this model, linear spin-wave theory yields a perfect description of the experimental dispersion. Furthermore, magnetic excitations in the ferromagnetic metallic state of Nd${}_{1-x}$Sr${}_x$MnO${}_3$ with x=0.49 and x=0.50 exhibit nearly the same magnon dispersion which can be described with a Heisenberg model including nearest-neighbor interactions.

References in corpus (3)

• Magnons in Ferromagnetic Metallic Manganites
• Spin waves throughout the Brillouin zone and magnetic exchange coupling in ferromagnetic metallic manganites La${}_{1-x}$Ca${}_x$MnO${}_3$ ($x=0.25,0.30$)
• Melting of magnetic correlations in charge-orbital ordered La(0.5)Sr(1.5)MnO(4) : competition of ferro and antiferromagnetic states

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• Theoretical analysis of neutron scattering results for quasi-two dimensional ferromagnets
• Strongly anharmonic collective modes in a coupled electron-phonon-spin problem
• Tunable phonon-driven magnon-magnon entanglement at room temperature
• Extreme disorder in crystalline perovskite oxide: a new paradigm in quantum materials research
• Quantum magnons of the intermediate phase of half-doped manganite oxides
• Semi-phenomenological analysis of neutron scattering results for quasi-two dimensional quantum anti-ferromagnet