Temperature Evolution of Energy Gap and Band Structure in the Superconducting and Pseudogap States of Bi2Sr2CaCu2O8+δ Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy

被引：0

作者：

孙璇 ^{[1
,2
]}

张文涛 ^{[1
]}

赵林 ^{[1
]}

刘国东 ^{[1
]}

顾根大 ^{[3
]}

彭钦军 ^{[4
]}

王志敏 ^{[4
]}

张申金 ^{[4
]}

杨峰 ^{[4
]}

陈创天 ^{[4
]}

许祖彦 ^{[4
]}

周兴江 ^{[1
,2
,5
]}

机构：

[1] National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences

[2] University of Chinese Academy of Sciences

[3] Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory

[4] Technical Institute of Physics and Chemistry, Chinese Academy of Sciences

[5] Collaborative Innovation Center of Quantum Matter

来源：

Chinese Physics Letters | 2018年 / 35卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy; Temperature Evolution of Energy Gap and Band Structure in the Superconducting and Pseudogap States of Bi2Sr2CaCu2O; Bi; ARPES; Figure; Sr;

D O I：

暂无

中图分类号：

O511.3 [];

学科分类号：

070205 ; 080705 ;

摘要：

We carry out detailed momentum-dependent and temperature-dependent measurements on Bi2Sr2CaCu2O8+δ(Bi2212) superconductor in the superconducting and pseudogap states by super-high resolution laser-based angleresolved photoemission spectroscopy. The precise determination of the superconducting gap for the nearly optimally doped Bi2212(Tc= 91 K) at low temperature indicates that the momentum-dependence of the superconducting gap deviates from the standard d-wave form(cos(2Φ)). It can be alternatively fitted by including a high-order term(cos(6Φ)) in which the next nearest-neighbor interaction is considered. We find that the band structure near the antinodal region smoothly evolves across the pseudogap temperature without a signature of band reorganization which is distinct from that found in Bi2Sr2CuO6+δsuperconductors. This indicates that the band reorganization across the pseudogap temperature is not a universal behavior in cuprate superconductors.These results provide new insights in understanding the nature of the superconducting gap and pseudogap in high-temperature cuprate superconductors.

引用

页码：98 / 102

页数：5