Volume 88, Number 2, October 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||10 November 2009|
Spectroscopic evidence for preformed Cooper pairs in the pseudogap phase of cuprates
Swiss Light Source, Paul Scherrer Institute - CH-5232 Villigen PSI, Switzerland
2 Paul Scherrer Institute, ETH Zurich and EPF Lausanne - 5232 Villigen PSI, Switzerland
3 Materials Science Division, Argonne National Laboratory - Argonne, IL 60439 USA
4 Department of Physics, University of Illinois at Chicago - Chicago, IL 60607 USA
5 Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute - CH-5232 Villigen PSI, Switzerland
6 Materials Physics, Royal Institute of Technology KTH - S-164 40 Kista, Sweden, EU
7 Department of Physics, Hokkaido University - Sapporo 060-0810, Japan
8 Condensed Matter Theory Group, Paul Scherrer Institute - CH-5232 Villigen PSI, Switzerland
Corresponding author: email@example.com
Accepted: 6 October 2009
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.
PACS: 74.72.Dn – La-based cuprates / 74.25.Jb – Electronic structure / 79.60.-i – Photoemission and photoelectron spectra
© EPLA, 2009
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