RCo₃化合物(R=Pr, Nd, Gd, Tb, Dy)の磁歪

抄録

Magnetostriction of polycrystalline RCo₃ compounds (R =Pr, Nd, Gd, Tb, Dy) was measured in the temperature range from 77 K to 350 K. The values of λ_//-λ_⊥ at T=77K and H=20 kOe were 40×10^-6 R=Pr, 1080×10^-6 for Nd, 80×10^-6 for Gd, 2680×10^-6 for Tb and 780×10^-6 for Dy. The sign of λ_//-λ_⊥ at H=20 kOe for DyCo₃ changes from negative to positive at about 170 K with increasing temperature. The dependence of the magnetostriction on R elements in RCo₃ compounds is discussed based on the point-charge model.