SPATIALLY VARYING ENERGY-GAP IN THE CUO CHAINS OF YBA2CU3O7-X DETECTED BY SCANNING TUNNELING SPECTROSCOPY

被引：108

作者：

EDWARDS, HL ^{[1
]}

DERRO, DJ ^{[1
]}

BARR, AL ^{[1
]}

MARKERT, JT ^{[1
]}

DELOZANNE, AL ^{[1
]}

机构：

[1] UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.75.1387

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Current-imaging tunneling spectroscopy (CITS) was performed on cold-cleaved single crystals of YBa2Cu3O7-x at 20 K. CITS data include I(V) curves taken simultaneously with a topographic scanning tunneling microscopic image. I(V) curves taken on CuO chains show an energy gap of about 20 me V which disappears near oxygen vacancies. We explain several features of large-junction I(V) measurements, photoemission spectroscopy, and single-point I(V) spectroscopy in terms of local effects detected by our CITS measurements. Finally, we consider the possibilities that this energy gap is due to either a charge-density wave or proximity-coupled superconductivity from the CuO2 planes.

引用

页码：1387 / 1390

页数：4

共 11 条

[1] INPLANE ANISOTROPY OF THE PENETRATION DEPTH IN YBA2CU3O7-X AND YBA2CU4O8 SUPERCONDUCTORS [J].