  Lanthanide hydrogen-rich materials have long been considered as one of the
candidates with high-temperature superconducting properties in condensed matter
physics, and have attracted great interest. Attempts to investigate the effects
of different compositions of lanthanide hydrogen-rich materials are ongoing,
with predictions and experimental studies in recent years having shown that
substances such as LaH 10 , CeH 9 , and LaH 16 exhibit extremely high
superconducting temperatures between 150-250 GPa. In particular, researchers
have noted that in those materials an increase in the f character at the Fermi
level leads to an increase in the superconducting temperature. Here, we further
elaborate on the effect of the ratios of lanthanide to hydrogen in these
substances with the aim to bring more clarity to the study of superhydrides in
these extreme cases by comparing a variety of lanthanide hydrogen-rich
materials with different ratios using the DMFT method, and provide ideas for
later structural predictions and material property studies.
