Electrical Resistance and Magnetic Susceptibility Evidence for Near Ambient Superconductivity in Nitrogen-Doped Lutetium Hydride

The discovery of superconductivity in nitrogen-doped lutetium hydride at near-ambient conditions has attracted significant attention¹ but also controversy as many experimental groups report no superconductivity at these conditions in Lu-N-H samples they have synthesized (e.g., Refs. ^2-5). We present the electrical resistance⁶ and magnetic susceptibility measurements on nitrogen-doped lutetium hydride samples that are in very good agreement with both previously reported Tc and its pressure dependence for nitrogen-doped lutetium hydride. We also find that the observation of these very high Tc is highly variable and that some samples, including those that have degraded over time, show no evidence for superconductivity