Abstract
Angle-resolved photoemission on underdoped La 1.895 Sr 0.105 CuO 4
reveals that in the pseudogap phase, the dispersion has two branches
located above and below the Fermi level with a minimum at the Fermi
momentum. This is characteristic of the Bogoliubov dispersion in
the superconducting state. We also observe that the superconducting
and pseudogaps have the same d -wave form with the same amplitude.
Our observations provide direct evidence for preformed Cooper pairs,
implying that the pseudogap phase is a precursor to superconductivity.
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