Excitations and magnetization density distribution in the dilute ferromagnetic semiconductor Yb14MnSb11

One rare example of a Kondo lattice compound with ferromagnetic dominated RKKY interactions is Yb₁₄MnSb₁₁. As a ferromagnetic semiconductor with T_c≈53~K, it is also a potential compound for exploration of spintronic devices. This material is furthermore one of the most efficient high temperature thermoelectrics. We describe measurements which answer remaining questions regarding the energy scales of the exchange interactions, the valence and the magnetization density distribution in this system. We also find that the system consists of RKKY exchange coupled Mn²⁺ sites with nearest and next nearest exchange interactions dominating the magnetic spectrum with no significant magnetization density localized on other atomic sites. The extended spread of a negative magnetization around each of the Mn ions supports a Kondo screening cloud scenario for Yb₁₄MnSb₁₁.