2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/26705We report on a comprehensive optical, transport and thermodynamic study of the Zintl compound Yb$_{14}$MnSb$_{11}$, demonstrating that it is the first ferromagnetic Kondo lattice compound in the underscreened limit. We propose a scenerio whereby the combination of Kondo and Jahn-Teller effects provides a consistent explanation of both transport and optical data.4 pagesStrongly Correlated Electronstext