Evolution of spin-wave excitations in ferromagnetic metallic manganites

Abstract

Neutron scattering results are presented for spin-wave excitations of three ferromagnetic metallic $A_{1-x}{A}_x^{\prime }$MnO${}_3$ manganites (where $A$ and $A^{\prime }$ are rare- and alkaline-earth ions), which when combined with previous work elucidate 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 ($J_4/J_1$) 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.

Submitted to Phys. Rev. Lett

References in corpus (8)

• Evolution of the low-frequency spin dynamics in ferromagnetic manganites
• Magnon Damping by magnon-phonon coupling in Manganese Perovskites
• Spin Excitation Spectrum of La${}_{1-x}{A}_x$MnO${}_3$
• Softening and Broadening of the Zone Boundary Magnons in Pr0.63Sr0.37MnO3
• Theory of anomalous magnon softening in ferromagnetic manganites
• Spin dynamics of strongly-doped La_{1-x}Sr_xMnO_3
• Magnon Broadening Effect by Magnon-Phonon Interaction in Colossal Magnetoresistance Manganites
• Effects of the On-Site Coulomb Repulsion in Double Exchange Magnets

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