A NEW QUASI-LSING MAGNET

We have performed measurements of the magnetization and differential m agnetic susceptibility of Dy0.62Y2.38Fe5O12 single crystals in pulsed magnetic fields up to 45 T at liquid-helium temperature for three orie ntations of the external field: H parallel to [100], H parallel to [11 0], and H parallel to [111]. It was found that the magnetization rever sal in the rare-earth magnetic subsystem occurs via several phase tran sitions, whose number depends on the direction of the external field, as is characteristic for Ising magnets. The anomalies in the field dep endences of the magnetization are interpreted on the assumption of qua si-Ising ordering of the rare-earth ions. (C) 1998 American Institute of Physics. [S0021-3640(98)00708-7]