Magnetization curves of a Tb/sub 3/(Fe,V)/sub 29/ single crystal

A Tb/sub 3/(Fe,V)/sub 29/ single crystal has been grown using the Czochralski method. Magnetization measurements along the hard axis of the crystal are presented. At low temperatures, a first-order magnetization process of type II occurs at large critical fields (/spl mu//sub 0/H/sub c/=10.6 T at T=5 K). The data were analysed using the first-principle model in terms of exchange and crystal-field interactions. The second order crystal-field coefficients of two rare earth sites are estimated to be A/sub 20/=-36K.a/sub 0//sup -2/ for the 4i site, and A/sub 20/=+16K.a/sub 0//sup -2/ for the 2a site.