Muon-spin-relaxation and bulk measurements of the magnetic-field penetration depth suggest that the cuprate high-Tc, bismuthate, organic Chevrel-phase, and heavy-fermion systems possibly belong to a unique group of superconductors characterized by high transition temperatures Tc relative to the values of nₛ/m* (carrier density/effective mass). This feature distinguishes these exotic superconductors from ordinary BCS superconductors.
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Uemura et al. (1991) studied this question.
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