Spin excitations in ferromagnetic manganites with orbital order

Details Spin excitations in ferromagnetic manganites with orbital order Spin excitations in ferromagnetic manganites with orbital order

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004njph....6..190b&link_type=abstract

New Journal of Physics, Volume 6, Issue 1, pp. 190 (2004).

Physics

Scientific paper

The ferromagnetic metallic phase of doped cubic manganites with orbital order is investigated in a two-band double exchange model extended by Jahn Teller (JT) terms. Evaluating the spin wave self-energy in the lowest order 1/S expansion, one finds that spin excitations are anisotropic and depend on the type of occupied eg orbitals. In the case of a small splitting between eg orbital energies, magnon dispersion exhibits a pronounced asymmetry between low and high hole doping, while a strong JT effect leads to the alternating orbital order which can reduce the spin stiffness by one order of magnitude. For a bilayer system, the kinetic energy induces an x2 - y2 orbital character and is responsible for a drastic change in the interplane exchange coupling in the doping range 0.3 < x < 0.5.

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