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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• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
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• Evolution from a nodeless gap to d(x2-y2) form in underdoped La(2-x)SrxCuO4
• Transport implications of Fermi arcs in the pseudogap phase of the cuprates
• Superconductivity distorted by the coexisting pseudogap in the antinodal region of Bi${}_{1.5}$Pb${}_{0.55}$Sr${}_{1.6}$La${}_{0.4}$CuO${}_{6+\delta }$: A photon-energy-dependent angle-resolved photoemission study
• Pairing and the phase diagram of the normal coherence length ${\xi }_N(T,x)$ above $T_c$ of $L{a}_{2-x}S{r}_{x}Cu{O}_4$ thin films probed by the Josephson effect
• Non-Fermi liquid scattering against an emergent Bose liquid: manifestations in the kink and other exotic quasiparticle behaviors in the normal-state cuprate superconductors
• Origin of the Fermi arcs in cuprates: a dual role of quasiparticle and pair excitations
• Flow equation approach to the linear response theory of superconductors
• Reduced effect of impurities on the universal pairing scale in the cuprates
• Spectroscopic Bogoliubov features near the unitary limit
• The magnon-mediated attraction between two holes doped in a CuO${}_2$ layer
• Unconventional particle-hole mixing in the systems with strong superconducting fluctuations
• Competition between superconductivity and spin density wave
• Quasiparticle states driven by a scattering on the preformed electron pairs
• Fluctuation conductivity due to the preformed local pairs