Possible Nodeless Superconducting Gaps in Bi2Sr2CaCu2O8+δ and YBa2Cu3O7-x Revealed by Cross-Sectional Scanning Tunneling Spectroscopy

被引：0

作者：

任明强 ^{[1
,2
]}

闫亚军 ^{[1
,2
]}

张童 ^{[1
,2
]}

封东来 ^{[1
,2
]}

机构：

[1] State Key Laboratory of Surface Physics,Department of Physics,and Advanced Materials Laboratory,Fudan University

[2] Collaborative Innovation Center of Advanced Microstructures

来源：

Chinese Physics Letters | 2016年 / 33卷 / 12期

基金：

中国国家自然科学基金;

关键词：

of; is; in; Revealed by Cross-Sectional Scanning Tunneling Spectroscopy; and YBa2Cu3O; Possible Nodeless Superconducting Gaps in Bi2Sr2CaCu2O; by; DOS; on; Bi; Cu; Sr;

D O I：

暂无

中图分类号：

O469 [凝聚态物理学]; TM26 [超导体、超导体材料];

学科分类号：

070205 ; 0805 ; 080502 ; 080801 ;

摘要：

Pairing in the cuprate high-temperature superconductors and its origin remain among the most enduring mysteries in condensed matter physics.With cross-sectional scanning tunneling microscopy/spectroscopy we clearly reveal the spatial-dependence or inhomogeneity of the superconducting gap structure of BiSrCaCuO(Bi2212) and YBaCuO(YBCO) along their c-axes on a scale shorter than the interlayer spacing.By tunneling into the(100) plane of a Bi2212 single crystal and a YBCO film,we observe both U-shaped tunneling spectra with extended flat zero-conductance bottoms,and V-shaped gap structures,in different regions of each sample.On the YBCO film,tunneling into a(110) surface only reveals a U-shaped gap without any zero-bias peak.Our analysis suggests that the U-shaped gap is likely a nodeless superconducting gap.The V-shaped gap has a very small amplitude,and is likely proximity-induced by regions having the larger U-shaped gap.

引用

页码：128 / 132

页数：5