EVIDENCE FOR A MAGNETIC-POLARON STATE IN THE LOW-CARRIER SYSTEM CEP

Elastic neutron-scattering experiments performed in the low-carrier sy stem CeP show interesting magnetic diffraction patterns under a magnet ic field. They can be explained by the stacking of the ferromagnetical ly coupled GAMMA8 double Ce layers among the antiferromagnetically cou pled GAMMA7 layers with a period of eleven Ce layers along the field d irection, even though the crystal-field level energy of GAMMA8 is 160 K. The result gives direct evidence for the existence of the magnetic- polaron state in CeP proposed by Kasuya et al.