Spectroscopic evidence for preformed Cooper pairs in the pseudogap phase of cuprates

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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Cited by in corpus (4)

• Energy gaps in high-transition temperature cuprate superconductors
• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• Evolution from a nodeless gap to d(x2-y2) form in underdoped La(2-x)SrxCuO4
• The magnon-mediated attraction between two holes doped in a CuO${}_2$ layer