The phase diagram of the superconducting high-Tc cuprates is governed by two energy scales: T*, the temperature below which a gap is opened in the excitation spectrum, and Tc, the superconducting transition temperature. The way these two energy scales are reflected in the low-temperature energy gap is being intensively debated. Using Zn substitution and carefully controlled annealing 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 the size of the coherence peak at the gap edge.
|Journal||Physical Review Letters|
|State||Published - 25 Jan 2011|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)