Meissner effect in nonstandard superconductors

It was recently pointed out that so-called “superhydrides”, hydrogen-rich materials appear to become superconducting at high temperatures and pressures, exhibit physical properties are different from both conventional unconventional standard type I II superconductors [1,2]. Here we consider magnetic field expulsion in the first material this class discovered 2015, sulfur hydride [3]. A nuclear resonant scattering experiment has been interpreted as demonstration Meissner effect takes place [4,5]. point observed effect, under assumption system is thermodynamic equilibrium, implies a pressure [6] much larger than of superconductors. This suggests qualitatively known if they