GAP ANISOTROPY OF BI2SR2CACU2O8 MEASURED BY LOW-TEMPERATURE SCANNING TUNNELING MICROSCOPY

被引：31

作者：

CHEN, Q

NG, KW

机构：

[1] Department of Physics and Astronomy, University of Kentucky, Lexington

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.45.2569

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Energy gaps of single-crystal Bi2Sr2CaCu2O8 in the c-axis and the ab-plane directions are measured directly by the scanning-tunneling-microscopy method. Due to the short coherence length along the c axis, conductance curves in this direction are seriously smeared and do not fit the conventional BCS density of states. In the ab direction, the shapes of the conductance curves are different from that of c-axis tunneling and show sharper gap features. The energy gap in the ab direction is measured to be 35 meV, which is 10 meV larger than the value in the c-axis direction.

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页码：2569 / 2572

页数：4

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