Spin Polarization of Conduction Electrons Due to s-d Exchange Interaction

摘要: The spin polarization σ of the conduction electrons due to the sd exchange interaction with a localized spin and the magnitude of the localized spin are calculated by the Rayleigh-Schrödinger perturbation method up to the fourth order in J. It is found that the relation σ=(ρ J/2 N)≪ S z> holds, where≪ S z> is the expectation value of the localized spin in the ground state and ρ is the state density of the conduction electrons at the Fermi surface. The magnitude of the localized spin≪ S z> can be expressed in the form if we take only the first …