Temperature Evolution of Energy Gap and Band Structure in the Superconducting and Pseudogap States of Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy

作     者：Xuan Sun Wen-Tao Zhang Lin Zhao Guo-Dong Liu Gen-Da Gu Qin-Jun Peng Zhi-Min Wang Shen-Jin Zhang Feng Yang Chuang-Tian Chen Zu-Yan Xu Xing-Jiang Zhou 孙璇;张文涛;赵林;刘国东;顾根大;彭钦军;王志敏;张申金;杨峰;陈创天;许祖彦;周兴江

作者机构：National Laboratory for SuperconductivityBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190 University of Chinese Academy of SciencesBering 100049 Condensed Matter Physics and Materials Science DepartmentBrookhaven National LaboratoryUptonNew York 11973USA Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190 Collaborative Innovation Center of Quantum MatterBeijing 100871 

出 版 物：《Chinese Physics Letters》 (中国物理快报(英文版))

年 卷 期：2018年第35卷第1期

页      面：90-94页

核心收录：

学科分类：080705[工学-制冷及低温工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0807[工学-动力工程及工程热物理] 0702[理学-物理学] 

基　　金：Supported by the National Key Research and Development Program of China under Grant No 2016YFA0300300 the National Natural Science Foundation of China under Grant No 11334010 the National Basic Research Program of China under Grant No2015CB921300 the Strategic Priority Research Program(B)of the Chinese Academy of Sciences under Grant No XDB07020300 

主　　题：Copper compounds 

摘      要：We carry out detailed momentum-dependent and temperature-dependent measurements on Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)(Bi2212)superconductor in the superconducting and pseudogap states by super-high resolution laser-based angleresolved photoemission *** precise determination of the superconducting gap for the nearly optimally doped Bi2212(T_(c)=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 *** 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 Bi_(2)Sr_(2)CuO_(6+δ)*** indicates that the band reorganization across the pseudogap temperature is not a universal behavior in cuprate *** results provide new insights in understanding the nature of the superconducting gap and pseudogap in high-temperature cuprate superconductors.