ROTATIONAL SPIN-GLASS PROPERTIES OF TB0.3Y0.7AG

This cubic pseudobinary compound with antiferromagnetic order and spin-glass properties below Tg (36 K) was studied by magnetization-vector measurements on a field-cooled (FC) polycrystalline sample disk rotated in various fixed fields (H). At 4.2 K, the FC-induced anisotropy field HK is seen to turn rigidly with the sample for all rotation angles (θ≤180°) even at H=15 kOe, and since the rotational magnetization follows HK very closely, it is deduced that H K >100 kOe. At 20 K, HK turns rigidly, but only below a threshold field, above which HK rotates up to some critical angle relative to H, where it remains as the sample continues to turn. Thus H K rotates frictionally relative to the sample. Nevertheless, it is found that its magnitude continues to exceed 100 kOe.