Muon-spin-relaxation and bulk measurements of the magnetic-field penetration depth suggest that the cuprate high-7V, bismuthate, organic, Chevrel-phase, and heavy-fermion systems possibly belong to a unique group of superconductors characterized by high transition temperatures T c relative to the values of n s /m* (carrier density/effective mass). This feature distinguishes these exotic superconductors from ordinary BCS superconductors.
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