Theory of spin wave excitations of metallic A-type antiferromagnetic manganites

Details Theory of spin wave excitations of metallic A-type antiferromagnetic manganites Theory of spin wave excitations of metallic A-type antiferromagnetic manganites

2000-12-10

arxiv.org/abs/cond-mat/0012166v2

Phys. Rev. B 64, 092403 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.092403

The spin dynamic of the metallic A-type antiferromagnetic manganites is studied. An effective nearest-neighbour Heisenberg spin wave dispersion is derived from the double exchange model taking into account the superexchange interaction between the core spins. The result of inelastic neutron scattering experiment on ${Nd}_{0.45}{Sr}_{0.55}{Mn} {O}_{3}$ is qualitatively reproduced. Comparing theory with experimental data two main parameters of the model: nearest-neighbour electron transfer amplitude and superexchange coupling between the core spins are estimated.

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