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Spin Excitations in Doped Manganites

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Abstracts
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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Contributors
author
  • Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
  • Max-Planck-Institut FKF, Heisenbergstrasse 1, 70569 Stuttgart, Germany
author
  • Institute for Theoretical Physics, Utrecht University, 3584 CC Utrecht, The Netherlands
  • Philips Research Labs, Prof. Holstlaan 4, 5656 AA Eindhoven, The Netherlands
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bwmeta1.element.bwnjournal-article-appv97z120kz
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