SCANNING TUNNELING SPECTROSCOPY ON HIGH-TC SUPERCONDUCTORS

被引：28

作者：

HASEGAWA, T ^{[1
]}

NANTOH, M ^{[1
]}

HEIKE, S ^{[1
]}

TAKAGI, A ^{[1
]}

OGINO, M ^{[1
]}

KAWASAKI, M ^{[1
]}

KOINUMA, H ^{[1
]}

KITAZAWA, K ^{[1
]}

机构：

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

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1993年 / 54卷 / 10期

关键词：

TUNNELING SPECTROSCOPY; STM; SUPERCONDUCTING GAP;

D O I：

10.1016/0022-3697(93)90193-U

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Superconducting pp structures of Bi2Sr2CaCuOy (BSCCO) and YBa2Cu3Oy (YBCO) have been probed by the 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 observations 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 the anisotropy of the gap functions.

引用

页码：1351 / 1357

页数：7

共 15 条

[1]

ANNETT JF, 1990, PHYSICAL PROPERTIES, V2

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