抄録
Measurements of magnetization, magnetic susceptibility, magnetocrystalline anisotropy and electrical resistivity were carried out at temperatures from 4.2 K to 700 K on Gd–Lu single crystal alloys. It was found that both of the saturation magnetic moment and the paramagnetic moment per atom are larger than those calculated by assuming a simple dilution of the ferromagnetic Gd with nonmagnetic Lu. The anisotropy constants at 4.2 K were drastically changed by addition of Lu. It is inferred that the excess moments and the drastic change of the anisotropy may be ascribed to the polarization of the 5d electrons of Lu atom site. From the measurements of the residual resistivity and spin disorder resistivity along the c-axis and b-axis, it is suggested that the occurrence of helical antiferromagnetism is associated with the distortion of the Fermi surface along the c-axis.
