DISTINCTIVE FEATURES OF NOVEL SUPERCONDUCTING TRANSITIONS IN UNDERDOPED AND OVERDOPED HIGH-T_c CUPRATES

It is argued that the new theory that combines the precursor BCS-like non-superconducting (SC) pairing and the Cooper-pair condensation into a superfluid Bose-liquid state is more plausible than the standard SC fluctuation approach in describing the distinctive features of the underdoped and overdoped high-T c cuprates. We show that the scenarios for high-T c superconductivity in these materials are quite different on the character of the Cooper-pair formation and SC phase transitions.

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