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  1. 1 Acta Physica Polonica A

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  1. 1 2000

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  1. 1 Feiner L.

  2. 1 Oleś A.

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Spin Excitations in Doped Manganites

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Oleś A., Feiner L.
Acta Physica Polonica A
|
2000
|
vol. 97
|
issue 1
193-196
EN
We generalize the double exchange to describe holes doped in degenerate e_{g} orbitals in La_{1-x}A_{x}MnO_{3} manganites, where A are divalent alkaline earth ions. Assuming an orbital liquid of disordered e_{g} orbitals we find isotropic ferromagnetic exchange interactions which increase with hole doping. The magnon dispersion agrees very well with the experimental data in ferromagnetic metallic manganites.
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