Superconductivity pairing induced by two level systems in amorphous metals

From the standard interaction between electrons and two level systems a superconductive pairing is envisaged. The solutions of the Eliashberg equations for the critical temperature as well as the zero temperature gap lead to expressions as exp (?1/√λ₀) instead of exp (?1/λ₀) in the BCS case, which enhances considerably the superconducting properties in the weak coupling case.