Abstract
Measurements of magnetization were carried out for single crystals of TbCu4Ag and GdCu4Ag under magnetic field up to 18 T at temperatures of 1.7, 3.0 and 4.2 K. At 4.2 K, two stepped field-induced transitions were observed in magnetizing process along all the [111], [110] and [100] directions. At 1.7 K four stepped transitions were observed only along the [100] direction. For GdCu4Ag unusual increase of magnetization was observed in high field magnetization process.