Investigating the Crystal Structure of Nitrogen-Doped Lutetium Hydride at High Pressure

Hydrogen rich high temperature superconductors discovered recently exhibit conventional superconductivity mediated by strong electron-phonon coupling, under high pressures. These metal hydride compounds have long been investigated in an effort to increase T_c via chemical doping. Currently, there are many efforts to dope metal hydride systems with lighter elements in order to find stable or metastable phases at lower pressures. The intrinsic link between atomic configuration and physical properties demands the most accurate determination of the structure of these materials. Here we investigate the crystal structure of Nitrogen-Doped Lutetium Hydride system. We present high pressure X-ray diffraction, Raman spectroscopy and neutron diffraction measurements and explore the pressure dependence of the structure of Nitrogen-Doped Lutetium Hydride.