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Non-Stoner continuum in the double exchange model.

T A Kaplan1, S D Mahanti, Y S Su

  • 1Michigan State University, East Lansing, Michigan 48824, USA.

Physical Review Letters
|May 1, 2001
PubMed
Summary

New research reveals previously unknown continuum states in the double exchange model, bridging the energy gap between magnons and Stoner continuum. These findings challenge existing models and may impact understanding of material properties.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • The double exchange model describes magnetic interactions in materials.
  • Current understanding posits magnons and Stoner continuum as distinct energy excitations.

Purpose of the Study:

  • To investigate the electronic excitation spectrum within the double exchange model.
  • To identify any states that may exist between magnons and the Stoner continuum.

Main Methods:

  • Utilizing exact diagonalization techniques.
  • Analyzing the single-spin-flip excitation channel.

Main Results:

  • Discovery of continuum states in the single-spin-flip channel.
  • These states overlap with magnons at low energies (~10^-2 eV) and extend to higher energies (~eV).
  • This challenges the traditional view of a distinct energy gap.

Conclusions:

  • The identified continuum states fill the energy gap between magnons and the Stoner continuum.
  • These states are relevant for understanding inelastic neutron scattering and optical properties.

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