title: Insensitivity of the superconducting gap to variations in the critical temperature of Zn-substituted Bi2Sr2CaCu2O(8+δ) superconductors.
abstract: The phase diagram of the superconducting high-T(c) cuprates is governed by two energy scales: T*, the temperature below which a gap is opened in the excitation spectrum, and T(c), 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 T(c)'s, and measured their gap using angle-resolved photoemission spectroscopy (ARPES). We show that T(c) is not related to the gap shape or size, but it controls the size of the coherence peak at the gap edge.
authors.affiliation: Department of Physics, Technion, Haifa, Israel.
authors.forename: Y
authors.initials: Y
authors.lastname: Lubashevsky
authors.forename: A
authors.initials: A
authors.lastname: Garg
authors.forename: Y
authors.initials: Y
authors.lastname: Sassa
authors.forename: M
authors.initials: M
authors.lastname: Shi
authors.forename: A
authors.initials: A
authors.lastname: Kanigel