Synthesis and superconducting properties of praseodymium superhydride*

Recently, many hydrogen-rich superhydrides with interesting superconducting properties have been synthesized at high-pressure temperature conditions. Still, the experimental synthesis of pure, stoichiometric superhydrides at relatively lower pressures remains largely unexplored. We are interested in synthesizing pure, stoichiometric hydrogen-rich materials at the lowest possible pressure. Pure hydrogen (H₂), ammonia borane (NH₃BH₃), and paraffin (C_nH_2n+2) are being used as hydrogen sources for the synthesis of hydrides. However, it is unclear how additional elements such as B, N, and C present in ammonia borane and paraffin affect the structure and superconducting properties of hydrides. Here, we present the synthesis of various Pr-H phases carried out using pure hydrogen and elemental praseodymium. We will also present the superconducting properties calculated for the synthesized Pr-H phases. The structural properties of the superhydride phase will be compared with the literature report where the phase was synthesized using ammonia borane. This study will help to understand the effect of various hydrogen sources on the structural parameters of superconducting hydrides.