STM STUDY OF ANISOTROPIC SUPERCONDUCTING GAP OF BI2SR2CACU2O8

被引：29

作者：

ICHIMURA, K

NOMURA, K

机构：

[1] Department of Physics, Hokkaido University

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1993年 / 62卷 / 10期

关键词：

BI-BASED CUPRATE SUPERCONDUCTOR; STM SPECTROSCOPY; ANISOTROPIC SUPERCONDUCTING GAP; PENETRATION DEPTH; PAIRING SYMMETRY;

D O I：

10.1143/JPSJ.62.3661

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electron tunneling study was carried out on Bi2Sr2CaCu2O8 with use of the scanning tunneling microscope. Both the cleaved and lateral surface of single crystal were investigated. The electronic density of states for the superconducting phase was correctly obtained at the lateral surface. It shows the finite gap on the whole Fermi surface clearly, while the gap has a considerable anisotropy. The temperature dependence of the magnetic field penetration depth was also measured and its thermally activated behavior confirmed the finite gap again. These results indicate the large s-wave component in the pair wave function and the fair contribution of d-wave as well. The attractive force between electrons is not only due to the on-site interaction, but also the extended one.

引用

页码：3661 / 3679

页数：19

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