Angle-resolved photoemission on underdoped La1.895Sr0.105CuO4 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. Copyright (C) EPLA, 2009
Type
research article
Web of Science ID
WOS:000271963700032
Authors
Shi, M.
•
Bendounan, A.
•
Razzoli, E.
•
Rosenkranz, S.
•
Norman, M. R.
•
Campuzano, J. C.
•
•
Mansson, M.
•
Sassa, Y.
•
Claesson, T.
Publication date
2009
Published in
Volume
88
Issue
2
Article Number
27008
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
November 30, 2010
Use this identifier to reference this record