Search for Superconducting Hydrogen Compounds by Evolutionary Techniques

Abstract

Recently, superconductivity at 203 K was discovered in hydrogen sulfide at 155 GPa, and similar superconductivity has been expected in other hydrogen compounds. Computational predictions are useful for the study on crystal structure and superconductivity of hydrogen compounds under high-pressure. In this paper, we explain the background of the 203 K superconductivity discovery referring previous theoretical and experimental studies, and introduce our recent results on the superconductivity of sulfur-hydrogen and argon-hydrogen systems predicted by first-principles electronic structure calculations and evolutionary techniques for crystal structure search.