抄録
A canting spin ordering mechanism in degenerate antiferromagnetic semiconductors is studied based on the s–f exchange model. It is shown that even in the broad band case, as is similar to the double exchange mechanism for the narrow band case, the canting spin ordering is stable in low concentration of the conduction electron where the Fermi energy is comparable to or smaller than the s–f exchange energy. The phase diagram is different from that in the double exchange, the canting ordering can exist only for a finite value of concentration with a nearly constant ferromagnetic component in the whole temperature range and thus makes the transition to the ferromagnetic ordering with increasing temperature. These properties are consistent with the experiments in La1−xCaxMnO3 and TbCu1−xZnx.
