Spectacular doping dependence of interlayer exchange and other results on spin waves in bilayer manganites

Details Spectacular doping dependence of interlayer exchange and other results on spin waves in bilayer manganites Spectacular doping dependence of interlayer exchange and other results on spin waves in bilayer manganites

2001-05-11

arxiv.org/abs/cond-mat/0105230v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, which include 4 figures

Scientific paper

10.1103/PhysRevLett.87.217201

We report the measurement of spin waves in the bilayer colossal magnetoresistive manganites La(2-2x)Sr(1+2x)Mn2O7 with x=0.30, 0.35 and 0.40. For x=0.35 and 0.40 the entire acoustic and optic dispersion relations are reasonably well described by those for a bilayer Heisenberg Hamiltonian with nearest neighbour exchange only. The in-plane coupling is only weakly dependent on x, but the coupling between the planes of a bilayer changes by a factor of four. The results directly reveal the change from mixed and character of the orbitals to mostly character with increasing hole concentration.

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