Evidence for pairing above the transition temperature of cuprate superconductors from the electronic dispersion in the pseudogap phase |
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Authors: | Kanigel A Chatterjee U Randeria M Norman M R Koren G Kadowaki K Campuzano J C |
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Institution: | Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA. |
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Abstract: | 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 EF 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 difficult to reconcile with a competing order parameter, but is consistent with pairing without condensation. |
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