Anomalous Magnetoconductivity in Semimagnetic Semiconductors Showing Metallic Conduction

抄録

Anomalous magnetoconductivity in three demensions as a precursor effect of the Anderson localization is discussed for metallic samples of semimagnetic semiconductors such as Cd_1−xMn_xSe. Due to the large effective g-factor (of the order of 10²) arising from rather strong exchange interaction between electrons and magnetic ions (Mn ions), the spin flipping contribution to the quantum correction of the conductivity saturates at weak magnetic fields (∼1 kG). Parameters appropriate for Cd_0.95Mn_0.05Se gives a relative quantum correction of the conductivity of the order of 10⁻².