Observation of large tunneling-conductance variations in direct mapping of the energy gap of single-crystal
A Chang, ZY Rong, YM Ivanchenko, F Lu, EL Wolf - Physical Review B, 1992 - APS
A Chang, ZY Rong, YM Ivanchenko, F Lu, EL Wolf
Physical Review B, 1992•APSThe tunneling conductance G (V, x, y) is mapped with 5 Å resolution on cleaved ab planes of
Bi 2 Sr 2 CaCu 2 O 8− x crystals (T c= 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 Δ c, is observed on the ab plane. A more highly peaked G (V) with
reduced peak spacing is seen near (∼ 50 Å) specific sites, and over broader areas. It is
suggested that the striking variations in G (V, x, y) probably indicate local variations in BiO …
Bi 2 Sr 2 CaCu 2 O 8− x crystals (T c= 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 Δ c, is observed on the ab plane. A more highly peaked G (V) with
reduced peak spacing is seen near (∼ 50 Å) specific sites, and over broader areas. It is
suggested that the striking variations in G (V, x, y) probably indicate local variations in BiO …
Abstract
The tunneling conductance G (V, x, y) is mapped with 5 Å resolution on cleaved a-b planes of Bi 2 Sr 2 CaCu 2 O 8− x crystals (T c= 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 Δ c, is observed on the a-b plane. A more highly peaked G (V) with reduced peak spacing is seen near (∼ 50 Å) 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 CuO 2 layers.
American Physical Society以上显示的是最相近的搜索结果。 查看全部搜索结果