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In an attempt to destabilize the magnetic state of the heavy lanthanides Dyand Gd, extreme pressures were applied in an electrical resistivity measurementto 157 GPa over the temperature range 5 - 295 K. The magnetic orderingtemperature $T_{\text{o}}$ and spin-disorder resistance $R_{sd}$ of Dy, as wellas 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 functionof pressure, all three increasing sharply above 73 GPa, the critical pressurefor a 6\% volume collapse in Dy. At 157 GPa $T_{\text{o}}$ is estimated toreach temperatures in the range 370 - 500 K, the highest magnetic orderingtemperature of any lanthanide. In contrast, $T_{\text{o}% }(P)$ for Gd shows nosuch sharp increase to 105 GPa. Taken together, these results suggest thatpressures greater than 73 GPa transform Dy from a conventional magneticlanthanide into a Kondo lattice system with an anomalously high magneticordering temperature.

Magnetic Ordering at Anomalously High Temperatures in Dy at Extreme Pressures: a New Kondo-Lattice State?