Abstract
The phonon thermal conduction in La 1- X Ba X MnO 3 (LBMO) has been investigated for the Ba concentration X ≤0.45, where single phase samples can be prepared. The dominant phonon scatterer in this system is the Jahn–Teller local lattice distortions, which are relaxed in the ferromagnetic metallic phase with increasing charge carrier mobility. In comparison with other manganite systems, the phonon conductivity enhancement below T c is rather moderate in LBMO and the metallic behavior of LBMO is not so ideal, contrary to the anticipation based on the tolerance factor Γ values.
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