Figure 10.

Corresponding inverse magnetic susceptibility χ^–1 (circles) of Tb ions in single-crystal SrTb₂O₄ compound versus temperature, deduced from Figure 9. The solid line shows a CW behavior of the data from 180 to 280 K, which was extrapolated to χ^–1 = 0 (dash-dotted line) to show the PM Curie temperature θ_CW. The fit results are listed in Table 2. T₂ ≈ 161.8 K indicates the obvious deviation of the CW law behavior from measured data. We fit the measured data (from 2.8 to 20 K) with a combined lorentzian and linear function (dashed line) to obtain the anomaly of the measured data as marked at T₁ ≈ 9.6 K.