# Enhanced magnetic ordering in Sm metal under extreme pressure

## TL;DR

This study investigates how extreme pressure influences the magnetic ordering temperature of Sm metal, revealing a significant increase above 85 GPa and suggesting a transition to a highly correlated electron state similar to a Kondo lattice.

## Contribution

It provides new insights into the pressure-induced magnetic behavior of Sm metal and its comparison with other lanthanides, highlighting the emergence of a Kondo lattice state at high pressures.

## Key findings

- Magnetic ordering temperature of Sm increases sharply above 85 GPa.
- Sm exhibits a Kondo lattice-like state under extreme pressure.
- Comparison with Nd, Tb, Dy reveals similar pressure-dependent magnetic phenomena.

## Abstract

The dependence of the magnetic ordering temperature To of Sm metal was determined through four-point electrical resistivity measurements to pressures as high as 150 GPa. A strong increase in To with pressure is observed above 85 GPa. In this pressure range Sm ions alloyed in dilute concentration with superconducting Y exhibit giant Kondo pair breaking. Taken together, these results suggest that for pressures above 85 GPa Sm is in a highly correlated electron state, like a Kondo lattice, with an unusually high value of To. A detailed comparison is made with similar results obtained earlier on Nd, Tb and Dy and their dilute magnetic alloys with superconducting Y.