ENERGY-GAP AND SURFACE-STRUCTURE OF YBA2CU3O7-X PROBED BY SCANNING TUNNELING MICROSCOPY

被引：175

作者：

EDWARDS, HL

MARKERT, JT

DELOZANNE, AL

机构：

[1] Department of Physics, University of Texas, Austin

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.69.2967

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the results of scanning tunneling microscopy (STM) and spectroscopy (STS) studies on high-quality single crystals of YBa2Cu3O7-x (YBCO) which were cleaved in situ at 20 K prior to measurement. STS reveals an energy gap with 2DELTA/kT(c) = 6-8 and conductance curves with small zero bias conductance. STM images show for the first time the complex atomic structure of the YBCO surface; atomic resolution disappears after heating to 70 K. Large features may be due to the electronic effects of oxygen disorder, and YBCO is shown to cleave between the BaO and CuO chain layers.

引用

页码：2967 / 2970

页数：4

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