TY - JOUR
T1 - Proximity-Induced Pseudogap
T2 - Evidence for Preformed Pairs
AU - Yuli, Ofer
AU - Asulin, Itay
AU - Kalcheim, Yoav
AU - Koren, Gad
AU - Millo, Oded
PY - 2009/11/5
Y1 - 2009/11/5
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=70449922631&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.103.197003
DO - 10.1103/PhysRevLett.103.197003
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AN - SCOPUS:70449922631
SN - 0031-9007
VL - 103
JO - Physical Review Letters
JF - Physical Review Letters
IS - 19
M1 - 197003
ER -