Rare Earth Metal Single Crystals. II. Magnetic Properties of Tm, Eu, Sm, and Yb

Magnetic‐moment measurements are presented for single‐crystal Tm, Eu, Sm, and Yb along principal axes. The 4.2°K data for Tm and Eu extend to 140 kG, and the Sm and Yb results, at low field, range from 4.2° to ∼300°K. Almost complete ferromagnetic alignment in Tm is attained for 140 kG along the $\text{[101̄0]}$ direction. A value of almost 7 _μB is observed. Eu is antiferromagnetic, shows a linear variation of σ vs B_o up to 140 kG (in disagreement with earlier data), and appears to be isotropic. The susceptibility for Yb shows a small isotropic paramagnetic component, possibly caused by impurities. Single‐crystal data show that Sm is a uniaxial antiferromagnet with spins aligned along the c axis and T_N=14°K.