Evolution of incommensurate superstructure and electronic structure with Pb substitution in(Bi2-xPbx)Sr2CaCu2O8+δ superconductors  

作　　者：Jing Liu Lin Zhao Qiang Gao Ping Ai Lu Zhang Tao Xie( Jian-Wei Huang Ying Ding Cheng Hu Hong-Tao Yan Chun-Yao Song Yu Xu Cong Li Yong-Qing Cai Hong-Tao Rong Ding-Song Wu Guo-Dong Liu Qing-Yan Wang Yuan Huang Feng-Feng Zhang Feng Yang Qin-Jun Peng Shi-Liang Li Huai-Xin Yang Jian-Qi Li Zu-Yan Xu Xing-Jiang Zhou 刘静;赵林;高强;艾平;张璐;谢涛;黄建伟;丁颖;胡成;闫洪涛;宋春尧;徐煜;李聪;蔡永青;戎洪涛;吴定松;刘国东;王庆艳;黄元;张丰丰;杨峰;彭钦军;李世亮;杨槐馨;李建奇;许祖彦;周兴江(Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China;Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;Songshan Lake Materials Laboratory, Dongguan 523808, China;Collaborative Innovation Center of Quantum Matter, Beijing 100871, China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2]University of Chinese Academy of Sciences, Beijing 100049, China [3]Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China [4]Songshan Lake Materials Laboratory, Dongguan 523808, China [5]Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

出　　处：《Chinese Physics B》2019年第7期102-110,共9页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant Nos.2016YFA0300300 and 2017YFA0302900);the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant Nos.XDB07020300 and XDB25000000);the National Natural Science Foundation of China(Grant Nos.11334010 and 11534007);the Youth Innovation Promotion Association of Chinese Academy of Sciences(Grant No.2017013)

摘　　要：High-quality Bi2-xPbxSr2 CaCu2O8+δ(Bi2212) single crystals have been successfully grown by the traveling solvent floating zone technique with a wide range of Pb substitution(x = 0–0.8).The samples are characterized by transmission electron microscope(TEM) and measured by high resolution laser-based angle-resolved photoemission spectroscopy(ARPES) with different photon energies.A systematic evolution of the electronic structure and superstructure with Pb substitution has been revealed for the first time.The superstructure shows a significant change with Pb substitution and the incommensurate modulation vector(Q) decreases with increasing Pb substitution.In the meantime, the superstructure intensity from ARPES measurements also decreases dramatically with increasing Pb concentration.The superstructure in Bi2212 can be effectively suppressed by Pb substitution and it nearly disappears with a Pb substitution of x = 0.8.We also find that the superstructure bands in ARPES measurements depend sensitively on the photon energy of lasers used;they can become even stronger than the main band when using a laser photon energy of 10.897 eV.These results provide important information on the origin of the incommensurate superstructure and its control and suppression in bismuth-based high temperature superconductors.High-quality Bi2-xPbxSr2 CaCu2O8+δ（Bi2212） single crystals have been successfully grown by the traveling solvent floating zone technique with a wide range of Pb substitution（x = 0–0.8）.The samples are characterized by transmission electron microscope（TEM） and measured by high resolution laser-based angle-resolved photoemission spectroscopy（ARPES） with different photon energies.A systematic evolution of the electronic structure and superstructure with Pb substitution has been revealed for the first time.The superstructure shows a significant change with Pb substitution and the incommensurate modulation vector（Q） decreases with increasing Pb substitution.In the meantime, the superstructure intensity from ARPES measurements also decreases dramatically with increasing Pb concentration.The superstructure in Bi2212 can be effectively suppressed by Pb substitution and it nearly disappears with a Pb substitution of x = 0.8.We also find that the superstructure bands in ARPES measurements depend sensitively on the photon energy of lasers used;they can become even stronger than the main band when using a laser photon energy of 10.897 eV.These results provide important information on the origin of the incommensurate superstructure and its control and suppression in bismuth-based high temperature superconductors.

关 键 词：Bi2-xPbxSr2CaCu2O8+δ SUPERSTRUCTURE electronic structure angle-resolved PHOTOEMISSION spectroscopy(ARPES) modulation 

分 类 号：O511.3[一般工业技术—材料科学与工程]