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In contrast to a complex feature of antinodal state, suffering from competingorder(s), the "pure" pairing gap of cuprates is obtained in the nodal region,which therefore holds the key to the superconducting mechanism. One of thebiggest question is whether the point nodal state as a hallmark of d-wavepairing collapses at Tc like the BCS-type superconductors, or it insteadsurvives above Tc turning into the preformed pair state. A difficulty in thisissue comes from the small magnitude of the nodal gap, which has beenpreventing experimentalists from solving it. Here we use a laser ARPES capableof ultrahigh energy resolution, and detect the point nodes surviving far beyondTc in Bi2212. By tracking the temperature evolution of spectra, we reveal thatthe superconductivity occurs when the pair breaking rate is suppressed smallerthan the single particle scattering rate on cooling, which governs the value ofTc in cuprates.

Point nodes persisting far beyond Tc in Bi2212