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Conventional superconductors are characterized by a single energy scale, thesuperconducting gap, which is proportional to the critical temperature Tc . Inhole-doped high-Tc copper oxide superconductors, previous experiments haveestablished the existence of two distinct energy scales for doping levels belowthe optimal one. The origin and significance of these two scales are largelyunexplained, although they have often been viewed as evidence for two gaps,possibly of distinct physical origins. By measuring the temperature dependenceof the electronic Raman response of Bi2Sr2CaCu2O8+d (Bi-2212) and HgBa2CuO4+d(Hg-1201) crystals with different doping levels, we establish that these twoscales are associated with coherent excitations of the superconducting statewhich disappears at Tc. Using a simple model, we show that these two scales donot require the existence of two gaps. Rather, a single d-wave superconductinggap with a loss of Bogoliubov quasiparticle spectral weight in the antinodalregion is shown to reconcile spectroscopic and transport measurements.

Suppressed antinodal coherence with a single d-wave superconducting gap leads to two energy scales in underdoped cuprates