Evidence of near-ambient superconductivity in a N-doped lutetium hydride.
Nathan Dasenbrock-GammonElliot SniderRaymond McBrideHiranya PasanDylan DurkeeNugzari Khalvashi-SutterSasanka MunasingheSachith E DissanayakeKeith V LawlerAshkan SalamatRanga P DiasPublished in: Nature (2023)
The absence of electrical resistance exhibited by superconducting materials would have enormous potential for applications if it existed at ambient temperature and pressure conditions. Despite decades of intense research efforts, such a state has yet to be realized 1,2 . At ambient pressures, cuprates are the material class exhibiting superconductivity to the highest critical superconducting transition temperatures (T c ), up to about 133 K (refs. 3-5 ). Over the past decade, high-pressure 'chemical precompression' 6,7 of hydrogen-dominant alloys has led the search for high-temperature superconductivity, with demonstrated T c approaching the freezing point of water in binary hydrides at megabar pressures 8-13 . Ternary hydrogen-rich compounds, such as carbonaceous sulfur hydride, offer an even larger chemical space to potentially improve the properties of superconducting hydrides 14-21 . Here we report evidence of superconductivity on a nitrogen-doped lutetium hydride with a maximum T c of 294 K at 10 kbar, that is, superconductivity at room temperature and near-ambient pressures. The compound was synthesized under high-pressure high-temperature conditions and then-after full recoverability-its material and superconducting properties were examined along compression pathways. These include temperature-dependent resistance with and without an applied magnetic field, the magnetization (M) versus magnetic field (H) curve, a.c. and d.c. magnetic susceptibility, as well as heat-capacity measurements. X-ray diffraction (XRD), energy-dispersive X-ray (EDX) and theoretical simulations provide some insight into the stoichiometry of the synthesized material. Nevertheless, further experiments and simulations are needed to determine the exact stoichiometry of hydrogen and nitrogen, and their respective atomistic positions, in a greater effort to further understand the superconducting state of the material.
Keyphrases
- high temperature
- air pollution
- particulate matter
- room temperature
- ionic liquid
- visible light
- high resolution
- molecular dynamics
- dual energy
- quantum dots
- electron microscopy
- molecular dynamics simulations
- monte carlo
- density functional theory
- magnetic resonance imaging
- heat stress
- computed tomography
- quality improvement
- molecularly imprinted
- reduced graphene oxide
- human health
- amino acid