Spectroscopic evidence for preformed Cooper pairs in the pseudogap phase of cuprates.
Angle-resolved photoemission on underdoped La{sub 1.895}Sr{sub 0.105}CuO{sub 4} 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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; Swiss National Science Foundation; Ministry of Education and Science of Japan; Sswedish Research Council
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 971175
- Report Number(s):
- ANL/MSD/JA-65986
- Journal Information:
- EPL, Journal Name: EPL Journal Issue: 2009 Vol. 88; ISSN 0295-5075
- Country of Publication:
- United States
- Language:
- ENGLISH
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