Spectroscopic evidence for preformed Cooper pairs in the pseudogap phase of cuprates
2009 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 88, no 2Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2009. Vol. 88, no 2
high-t-c, underdoped bi2212, normal-state, superconductors, gap, bi2sr2cacu2o8+delta
IdentifiersURN: urn:nbn:se:kth:diva-18974DOI: 10.1209/0295-5075/88/27008ISI: 000271963700032ScopusID: 2-s2.0-78649249116OAI: oai:DiVA.org:kth-18974DiVA: diva2:337021
QC 201005252010-08-052010-08-052011-01-19Bibliographically approved