Interpretation of Thermal Conductivity in the Ferromagnetic Metallic Phase of La0.83Sr0.17MnO3 Manganites: Scattering of Phonons and Magnons

摘要: The lattice contribution to the thermal conductivity (κph) is theoretically analyzed within framework of Kubo model in La0.83Sr0.17MnO3 manganites. theory formulated when conduction limited by scattering phonons from defects, grain boundaries, charge carriers, and phonons. dominates La-Sr-MnO manganites artifact strong phonon-impurity -phonon mechanism ferromagnetic metallic state. electronic (κe) estimated following Wiedemann-Franz law. This estimate sets an upper bound on κe, vicinity Curie temperature (Tc) about 1% total heat transfer Another important phase should come spin waves (κm). It noticed that κm increases with a T2 dependence temperature. These channels for are algebraically added κtot develops broad peak at 120 K, before falling off lower temperatures. behaviour determined competition among several operating mechanisms carriers balance between electron, magnon, phonon contributions. numerical analysis shows similar results as those revealed experiments.