Electronic correlations and partial gap in the bilayer nickelate LaNiO.

The discovery of superconductivity with a critical temperature of about 80 K in LaNiO single crystals under pressure has received enormous attention. LaNiO is not superconducting under ambient pressure but exhibits a transition at T  ≃ 115 K. Understanding the electronic correlations and charge dynamics is an important step towards the origin of superconductivity and other instabilities.

Absence of near-ambient superconductivity in LuHN.

A recent study demonstrated near-ambient superconductivity in nitrogen-doped lutetium hydride. This stimulated a worldwide interest in exploring room-temperature superconductivity at low pressures. Here, by using a high-pressure and high-temperature synthesis technique, we have obtained nitrogen-doped lutetium hydride (LuHN), which has a dark-blue colour and a structure with the space group [Formula: see text] as evidenced by X-ray diffraction.