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Spin diffusion in double-exchange manganites.

A L Chernyshev1, R S Fishman

  • 1Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.

Physical Review Letters
|June 6, 2003
PubMed
Summary
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This study explores spin diffusion in double-exchange magnets using dynamical mean-field theory. The spin-diffusion coefficient becomes independent of Hund

Area of Science:

  • Condensed Matter Physics
  • Theoretical Magnetism

Background:

  • Double-exchange magnets are crucial for understanding colossal magnetoresistance.
  • Spin diffusion dynamics are key to magnetic properties in these materials.

Purpose of the Study:

  • To theoretically investigate spin diffusion in double-exchange magnets.
  • To determine the dependence of the spin-diffusion coefficient on Hund's coupling.

Main Methods:

  • Dynamical Mean-Field Theory (DMFT) was employed for theoretical analysis.
  • Calculations were performed for both Bethe and hypercubic lattices.

Main Results:

  • The spin-diffusion coefficient becomes independent of Hund's coupling (J(H)) under specific parameter conditions (J(H)S>>W>>T).

Related Experiment Videos

  • A close correspondence and some counterintuitive differences were observed between Bethe and hypercubic lattice results.
  • Results align with neutron-scattering data and prior high-temperature theoretical work.

    • Conclusions:

    • The findings provide insights into spin transport mechanisms in colossal magnetoresistive materials.
    • The study highlights the applicability and nuances of DMFT for complex magnetic systems.
    • Theoretical predictions are consistent with experimental observations in manganites.