Probing Hole-Induced Ferromagnetic Exchange in Magnetic Semiconductors by Inelastic Neutron Scattering

Abstract

The effect of hole doping on the exchange coupling of the nearest neighbor (NN) Mn pairs in ${\mathrm{Z}\mathrm{n}}_{1\ensuremath{-}x}{\mathrm{M}\mathrm{n}}_{x}\mathrm{T}\mathrm{e}$ is probed by inelastic neutron scattering. The difference in the NN exchange energy $\ensuremath{\Delta}{J}_{1}$ in the presence and in the absence of the holes is determined. The obtained value of $\ensuremath{\Delta}{J}_{1}$ is in good agreement with the predictions of the Zener/RKKY model, even on the insulator side of the metal-insulator transition.