Evolution of spin-wave excitations in ferromagnetic metallic manganites

Details Evolution of spin-wave excitations in ferromagnetic metallic manganites Evolution of spin-wave excitations in ferromagnetic metallic manganites

2005-12-16

arxiv.org/abs/cond-mat/0512368v1

Phys. Rev. Lett. 96, 047204 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.047204

Neutron scattering results are presented for spin-wave excitations of three ferromagnetic metallic $A_{1-x}A^{\prime}_{x}$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.

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