TY - JOUR
T1 - Observation of large tunneling-conductance variations in direct mapping of the energy gap of single-crystal Bi2Sr2CaCu2O8-x
AU - Chang, A.
AU - Rong, Zhao Y.
AU - Ivanchenko, Yu M.
AU - Lu, Farun
AU - Wolf, E. L.
PY - 1992
Y1 - 1992
N2 - The tunneling conductance G(V,x,y) is mapped with 5 resolution on cleaved a-b planes of Bi2Sr2CaCu2O8-x crystals (Tc=90 K) using scanning (vacuum) tunneling spectroscopy at 4.2 K. A strong, spatially varying G(V,x,y), evidently arising from a superconducting gap Δc, is observed on the a-b plane. A more highly peaked G(V) with reduced peak spacing is seen near (∼50) specific sites, and over broader areas. It is suggested that the striking variations in G(V,x,y) probably indicate local variations in BiO-layer metallicity, revealing an internal superconducting proximity effect between BiO and CuO2 layers.
AB - The tunneling conductance G(V,x,y) is mapped with 5 resolution on cleaved a-b planes of Bi2Sr2CaCu2O8-x crystals (Tc=90 K) using scanning (vacuum) tunneling spectroscopy at 4.2 K. A strong, spatially varying G(V,x,y), evidently arising from a superconducting gap Δc, is observed on the a-b plane. A more highly peaked G(V) with reduced peak spacing is seen near (∼50) specific sites, and over broader areas. It is suggested that the striking variations in G(V,x,y) probably indicate local variations in BiO-layer metallicity, revealing an internal superconducting proximity effect between BiO and CuO2 layers.
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U2 - 10.1103/PhysRevB.46.5692
DO - 10.1103/PhysRevB.46.5692
M3 - Article
AN - SCOPUS:0000654315
SN - 0163-1829
VL - 46
SP - 5692
EP - 5698
JO - Physical Review B
JF - Physical Review B
IS - 9
ER -