Proximity-Induced Pseudogap: Evidence for Preformed Pairs

Ofer Yuli*, Itay Asulin, Yoav Kalcheim, Gad Koren, Oded Millo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The temperature evolution of the proximity effect in Au/La2-xSrxCuO4 and La1.55Sr0.45CuO4/La2-xSrxCuO4 bilayers was investigated using scanning tunneling microscopy. Proximity-induced gaps, centered at the chemical potential, were found to persist above the superconducting transition temperature, Tc, and up to nearly the pseudogap crossover temperature in both systems. Such independence of the spectra on the details of the normal-metal cap layer is incompatible with a density-wave order origin. However, our results can be accounted for by a penetration of incoherent Cooper pairs into the normal metal above Tc.

Original languageAmerican English
Article number197003
JournalPhysical Review Letters
Issue number19
StatePublished - 5 Nov 2009


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