Evidence for pairing above the transition temperature of cuprate superconductors from the electronic dispersion in the pseudogap phase

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 l...

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Bibliographic Details
Published in:Physical review letters 2008-09, Vol.101 (13), p.137002-137002, Article 137002
Main Authors: Kanigel, A, Chatterjee, U, Randeria, M, Norman, M R, Koren, G, Kadowaki, K, Campuzano, J C
Format: Article
Language:English
Subjects:
CUPRATES
ENERGY GAP
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
MATERIALS SCIENCE
ORDER PARAMETERS
TRANSITION TEMPERATURE
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.101.137002