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The phase diagram of the superconducting high-Tc cuprates is governed by twoenergy scales: T*, the temperature below which a gap is opened in theexcitation spectrum, and Tc, the superconducting transition temperature. Theway these two energy scales are reflected in the low-temperature energy gap isbeing intensively debated. Using Zn substitution and carefully controlledannealing we prepared a set of samples having the same T* but different Tc's,and measured their gap using Angle Resolved Photoemission Spectroscopy (ARPES).We show that Tc is not related to the gap shape or size, but it controls thesize of the coherence peak at the gap edge.

Insensitivity of the superconducting gap to variation in Tc in Zn-substituted Bi2212