Magnetic Properties and Magnetovolume Effects in Gd_xY_1−xCo₂ (x≤0.2) Cluster Glasses

抄録

Magnetic properties of Gd_xY_1−xCo₂ with x≤0.2 were studied by means of magnetic, thermal expansion and forced magnetostriction measurements. Spontaneous magnetization disappears for x≤0.15. Maxima of magnetization were observed for 0.05≤x≤0.175 in the thermomagnetic curves at 100 Oe. Negative volume changes on the application of a magnetic field were detected for all samples except for x=0.15, where a positive volume change was observed at low fields. These results are ascribed to magnetic cluster glasses.