High-Tc Superconductivity of van der Waals Condensates

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The paper considers the possibility of superconductivity setting in when the distance aB between molecules (atoms) is such that aF < aB < aW, where aF and aW are the equilibrium separations in Fermi metals and van der Waals insulators. The last has no band sructure. This is the binding energy region 40--60 kJ/mol. However, neither stretch of metals ("dilution" by insulators) nor compression of insulators to a=aB produce substances stable under normal conditions. It was proposed to stabilize such substances prepared of insulators by adsorbing their atoms (molecules) on metal catalysts to obtain (Metal)(Insulator)ₓ-type systems for X > 1. The well-known method of metal sputtering in a gaseous atmosphere has used to successfully obtain such "sorption compounds" and collect with magnetic funnels clusters of diamagnetic particles kept suspended in a magnetic field gradient 100 G/cm at 300 K (the levitation effect).