ATOMIC SITE TUNNELING SPECTROSCOPY ON HIGH-T(C) SUPERCONDUCTORS

被引：8

作者：

HASEGAWA, T ^{[1
]}

NANTOH, M ^{[1
]}

TAKAGI, A ^{[1
]}

YAMAGUCHI, W ^{[1
]}

OGINO, M ^{[1
]}

KAWASAKI, M ^{[1
]}

GONG, JP ^{[1
]}

KOINUMA, H ^{[1
]}

KITAZAWA, K ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,ENGN MAT RES LAB,YOKOHAMA,KANAGAWA 227,JAPAN

来源：

PHYSICA B | 1994年 / 197卷 / 1-4期

关键词：

D O I：

10.1016/0921-4526(94)90264-X

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Superconducting gap structures of Bi2Sr2CaCu2Oy (BSCCO) and YBa2Cu3Oy (YBCO) have been probed by scanning tunneling microscopy (STM) at cryogenic temperatures. The tunneling conductance curves observed on bulk single crystals of BSCCO and epitaxial thin films of YBCO revealed clear overshooting peaks and flat bottom regions around V = 0 with quite low zero-bias conductances of approximately 1%. Since the electron tunneling process in STM is essentially incoherent, the present observation is favored by the s-wave pairing mechanism. However, the conductance curves were found to be substantially smeared in comparison with the conventional excitation spectra predicted in the BCS (isotropic s-wave) superconductors, suggesting gap anisotropy.

引用

页码：617 / 623

页数：7

共 18 条

[1] TUNNELING STUDY OF SUPERCONDUCTIVITY NEAR THE METAL-INSULATOR-TRANSITION [J].