OBSERVATION OF LARGE TUNNELING-CONDUCTANCE VARIATIONS IN DIRECT MAPPING OF THE ENERGY-GAP OF SINGLE-CRYSTAL BI2SR2CACU2O8-X

被引：45
作者：
CHANG, A
RONG, ZY
IVANCHENKO, YM
LU, FR
WOLF, EL
机构：
来源：
PHYSICAL REVIEW B | 1992年 / 46卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.46.5692
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The tunneling conductance G(V,x,y) is mapped with 5 angstrom resolution on cleaved a-b planes of Bi2Sr2CaCu2O8-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 DELTA(c), is observed on the a-b plane. A more highly peaked G ( V) with reduced peak spacing is seen near (approximately 50 angstrom) 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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页码：5692 / 5698
页数：7
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