High-Tc 2D ambient BCS superconductors in hydrogenated transition-metal borides

Crystal structures

The crystal structure of the M₂B₂H₄ monolayer is illustrated in Fig. 1. Layered M₂B₂H₄ adopts a 3D hexagonal structure with a space group symmetry of P6/mmm, analogous to Mg₂B₂. Figure 1 presents the side view and top view of…