ESR Study of Heavy Fermion State

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1)High field magnetization of Nd_2CuO_4 single crystal Is lnvestigated and the spin-flop and unidentified phase transitions are found. These transitions are attributed to those In the Nd spin system but the Interaction between Cu and Nd spins. ts not negligible to the transitions. The ESR measurement supports the present model.2)Anomalous electron spin resonance observed in Nd_2CuO_4 is attributed to antiferromagnetic resonance(AFMR)of Nd spins in the Nd-Cu spin network. The anomaly comes from the staggered field due to Cu spins on the Nd-site. The Cu spins form a tight antiferromagnetic spin network and are almost at rest during the Nd-resonance. The staggered field acts as an additional anisotropy field on the Nd spin. Various magnetic parameters in AFMR are in accord with those determined by the high field magnetization study.