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

Abstract

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.

4 figures, replaces arXiv:1404.4256v2

References in corpus (1)

• Visualizing heavy fermions emerging in a quantum critical Kondo lattice

Cited by in corpus (3)

• Anomalous Pressure Dependence of magnetic Ordering Temperature in Tb to 141 GPa: Comparison with Gd and Dy
• Enhanced magnetic ordering in Sm metal under extreme pressure
• Evidence for superconductivity in Rb metal above 55 GPa pressure