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Double exchange model for magnetic hexaborides.

Vitor M Pereira1, J M B Lopes dos Santos, Eduardo V Castro

  • 1Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA.

Physical Review Letters
|November 5, 2004
PubMed
Summary
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This study proposes a microscopic theory for rare-earth ferromagnetic hexaborides, explaining their transport properties and predicting Curie temperature behavior based on carrier concentration and spin disorder.

Area of Science:

  • Condensed matter physics
  • Materials science
  • Magnetism

Background:

  • Rare-earth hexaborides (Eu1-xCaxB6) exhibit complex magnetic and transport phenomena.
  • Reduced carrier concentrations in these materials are crucial for their electronic properties.

Purpose of the Study:

  • To develop a microscopic theory for ferromagnetic hexaborides.
  • To explain the observed transport properties using a theoretical model.
  • To predict the behavior of the Curie temperature (T(C)) in these materials.

Main Methods:

  • Utilizing a double-exchange Hamiltonian model.
  • Analyzing the impact of disordered spin background on spectral density.
  • Investigating the Fermi level's position relative to the mobility edge.

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Main Results:

  • The proposed model quantitatively describes Hall effect, magnetoresistance, frequency-dependent conductivity, and dc resistivity.
  • The theory successfully links reduced carrier concentration to the Fermi level's proximity to the mobility edge.
  • Specific predictions are made for Curie temperature (T(C)) dependence on plasma frequency (ωp).

Conclusions:

  • The double-exchange model provides a robust framework for understanding rare-earth hexaboride properties.
  • Disordered spin background and carrier concentration are key factors governing transport phenomena.
  • The theory offers predictive power for tuning magnetic properties through material composition and plasma frequency.