Robust magnetism against pressure in non-superconducting samples prepared from lutetium foil and H2/N2 gas mixture

TL;DR

This study investigates magnetic properties of lutetium hydride samples prepared with H2/N2 gas, revealing a magnetic transition at 56 K that remains stable under pressure, challenging claims of near-ambient superconductivity.

Contribution

The paper provides extended high-pressure magnetic measurements showing a robust magnetic phase in lutetium hydride, questioning previous superconductivity claims.

Findings

Magnetic transition at about 56 K detected

Magnetic phase remains stable up to 4.3 GPa

Results challenge claims of near-ambient superconductivity

Abstract

Recently, the claim of "near-ambient superconductivity" in a N-doped lutetium hydride attracted enormous following-up investigations in the community of condensed matter physics and material sciences. But quite soon, the experimental results from different groups indicate consistently that no evidence of near-ambient superconductivity is found in the samples synthesized by the same method as the reported one, or by the other alternative methods. From our extended high-pressure heat capacity and magnetic susceptibility measurements on the samples prepared with the lutetium foil and H2/N2 gas mixture, we report the finding of a magnetic transition at the temperature about 56 K. Our results show that this magnetic phase is robust against pressure up to 4.3 GPa, which covers the critical pressure of boosting the claimed near room temperature superconductivity.