Multigap superconductivity in HgS under pressure

Résumé fourni par la source

Mercury chalcogenides are a class of materials that exhibit many structural phases under pressure, hosting exotic physical properties, including topological phases and chiral phonons. In particular, recent experimental results [Zhang , ] on HgS report a new superconducting phase at ∼ 21 GPa , whose origin is unknown. In this work, we theoretically investigate the pressure-induced structural phase transition in HgS and the resulting emergence of superconductivity. Remarkably, we find that this phase supports a two-gap superconducting state arising from distinct Fermi surface sheets. The unusually high critical temperature of ∼ 11 K emerges naturally within this multiband scenario, highlighting the role of interband coupling beyond isotropic approximation. These results place HgS among the few systems where multiband superconductivity is observed.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.