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In previous studies the pressure dependence of the magnetic orderingtemperature $T_{\text{o}}$ of Dy was found to exhibit a sharp increase aboveits volume collapse pressure of 73 GPa, appearing to reach temperatures wellabove ambient at 157 GPa. In a search for a second such lanthanide, electricalresistivity measurements were carried out on neighboring Tb to 141 GPa over thetemperature range 3.8 - 295 K. Below Tb's volume collapse pressure of 53 GPa,the pressure dependence $T_{\text{o}}(P)$ mirrors that of both Dy and Gd.However, at higher pressures $T_{\text{o}}(P)$ for Tb becomes highly anomalous.This result, together with the very strong suppression of superconductivity bydilute Tb ions in Y, suggests that extreme pressure transports Tb into anunconventional magnetic state with an anomalously high magnetic orderingtemperature.

Anomalous Pressure Dependence of magnetic Ordering Temperature in Tb to 141 GPa: Comparison with Gd and Dy