  In an attempt to destabilize the magnetic state of the heavy lanthanides Dy
and Gd, extreme pressures were applied in an electrical resistivity measurement
to 157 GPa over the temperature range 5 - 295 K. The magnetic ordering
temperature $T_{\text{o}}$ and spin-disorder resistance $R_{sd}$ of Dy, as well
as the superconducting pair-breaking effect $\Delta T_{c}$ in Y(1 at.\% Dy),
are found to track each other in a highly non-monotonic fashion as a function
of pressure, all three increasing sharply above 73 GPa, the critical pressure
for a 6\% volume collapse in Dy. At 157 GPa $T_{\text{o}}$ is estimated to
reach temperatures in the range 370 - 500 K, the highest magnetic ordering
temperature of any lanthanide. In contrast, $T_{\text{o}% }(P)$ for Gd shows no
such sharp increase to 105 GPa. Taken together, these results suggest that
pressures greater than 73 GPa transform Dy from a conventional magnetic
lanthanide into a Kondo lattice system with an anomalously high magnetic
ordering temperature.
