Evidence for pairing above Tc from the dispersion in the pseudogap phase of cuprates

Details Evidence for pairing above Tc from the dispersion in the pseudogap phase of cuprates Evidence for pairing above Tc from the dispersion in the pseudogap phase of cuprates

2008-03-20

arxiv.org/abs/0803.3052v1

Phys. Rev. Lett 101, 137002 (2008)

Physics

Condensed Matter

Superconductivity

Scientific paper

In the underdoped high temperature superconductors, instead of a complete Fermi surface above Tc, only disconnected Fermi arcs appear, separated by regions that still exhibit an energy gap. We show that in this pseudogap phase, the energy-momentum relation of electronic excitations near E_F behaves like the dispersion of a normal metal on the Fermi arcs, but like that of a superconductor in the gapped regions. We argue that this dichotomy in the dispersion is hard to reconcile with a competing order parameter, but is consistent with pairing without condensation.

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