MAGNETIC STUDY ON KONDO SEMICONDUCTOR CENISN

There are two standpoints to explain the formation of the peak of magn etic susceptibility versus temperature in CeNiSn. One is the presence of the pseudo-gapped density of states (DOS) while the other is the de velopment of an antiferromagnetic correlation. To check which one is m ore reasonable, an experiment is designed on measuring magnetic suscep tibility under different magnetic fields. It is found that magnetic fi eld can shift the peak of the magnetic susceptibility to lower tempera tures while by calculation the presence of the pseudo-gapped DOS canno t shift the peak, which gives another evidence of the existence of ant iferromagnetic correlations and is discussed in the light of some rece nt theoretical model.