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.

arXiv comment4 figures, replaces arXiv:1404.4256v2

References in corpus (5)

• A Common Thread: the pairing interaction for the unconventional superconductors
• Spatial Fluctuations of Helical Dirac Fermions on the Surface of Topological Insulators
• Visualizing heavy fermions emerging in a quantum critical Kondo lattice
• Comparison of the pressure dependences of Tc in the trivalent d-electron superconductors
• Different routes to pressure-induced volume collapse transitions in gadolinium and terbium metals

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• Pressure-induced Frustration of Magnetic Coupling in Elemental Europium
• Evidence for superconductivity in Rb metal above 55 GPa pressure