Electronic structure of transition metal dichalcogenides PdTe2 and Cu0.05PdTe2 superconductors obtained by angle-resolved photoemission spectroscopy

doi:10.1088/1674-1056/24/6/067401

中国物理B ›› 2015, Vol. 24 ›› Issue (6): 67401-067401.doi: 10.1088/1674-1056/24/6/067401

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Electronic structure of transition metal dichalcogenides PdTe₂ and Cu_0.05PdTe₂ superconductors obtained by angle-resolved photoemission spectroscopy

刘艳^a, 赵建洲^a, 俞理^a, 林成天^b, 胡成^a, 刘德发^a, 彭莹莹^a, 谢卓晋^a, 何俊峰^a, 陈朝宇^a, 冯娅^a, 伊合绵^a, 刘旭^a, 赵林^a, 何少龙^a, 刘国东^a, 董晓莉^a, 张君^a, 陈创天^c, 许祖彦^c, 翁虹明^a, 戴希^a, 方忠^a, 周兴江^{a d}

a National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany;
c Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
d Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

收稿日期:2015-04-20 出版日期:2015-06-05 发布日期:2015-06-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11190022), the National Basic Research Program of China (Grant Nos. 2011CB921703 and 2011CBA00110), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB07020300).

Electronic structure of transition metal dichalcogenides PdTe₂ and Cu_0.05PdTe₂ superconductors obtained by angle-resolved photoemission spectroscopy

Liu Yan (刘艳)^a, Zhao Jian-Zhou (赵建洲)^a, Yu Li (俞理)^a, Lin Cheng-Tian (林成天)^b, Hu Cheng (胡成)^a, Liu De-Fa (刘德发)^a, Peng Ying-Ying (彭莹莹)^a, Xie Zhuo-Jin (谢卓晋)^a, He Jun-Feng (何俊峰)^a, Chen Chao-Yu (陈朝宇)^a, Feng Ya (冯娅)^a, Yi He-Mian (伊合绵)^a, Liu Xu (刘旭)^a, Zhao Lin (赵林)^a, He Shao-Long (何少龙)^a, Liu Guo-Dong (刘国东)^a, Dong Xiao-Li (董晓莉)^a, Zhang Jun (张君)^a, Chen Chuang-Tian (陈创天)^c, Xu Zu-Yan (许祖彦)^c, Weng Hong-Ming (翁虹明)^a, Dai Xi (戴希)^a, Fang Zhong (方忠)^a, Zhou Xing-Jiang (周兴江)^{a d}

a National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany;
c Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
d Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

Received:2015-04-20 Online:2015-06-05 Published:2015-06-05
Contact: Zhou Xing-Jiang E-mail:XJZhou@aphy.iphy.ac.cn
About author:74.70.-b; 74.25.Jb; 79.60.-i; 71.20.-b
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11190022), the National Basic Research Program of China (Grant Nos. 2011CB921703 and 2011CBA00110), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB07020300).

摘要/Abstract

摘要：

The layered transition metal chalcogenides have been a fertile land in solid state physics for many decades. Various MX₂-type transition metal dichalcogenides, such as WTe₂, IrTe₂, and MoS₂, have triggered great attention recently, either for the discovery of novel phenomena or some extreme or exotic physical properties, or for their potential applications. PdTe₂ is a superconductor in the class of transition metal dichalcogenides, and superconductivity is enhanced in its Cu-intercalated form, Cu_0.05PdTe₂. It is important to study the electronic structures of PdTe₂ and its intercalated form in order to explore for new phenomena and physical properties and understand the related superconductivity enhancement mechanism. Here we report systematic high resolution angle-resolved photoemission (ARPES) studies on PdTe₂ and Cu_0.05PdTe₂ single crystals, combined with the band structure calculations. We present in detail for the first time the complex multi-band Fermi surface topology and densely-arranged band structure of these compounds. By carefully examining the electronic structures of the two systems, we find that Cu-intercalation in PdTe₂ results in electron-doping, which causes the band structure to shift downwards by nearly 16 meV in Cu_0.05PdTe₂. Our results lay a foundation for further exploration and investigation on PdTe₂ and related superconductors.

关键词: transition metal dichalcogenides, PdTe₂, superconductor, photoemission

Abstract:

Key words: transition metal dichalcogenides, PdTe₂, superconductor, photoemission

中图分类号: (Superconducting materials other than cuprates)

74.70.-b

74.25.Jb (Electronic structure (photoemission, etc.)) 79.60.-i (Photoemission and photoelectron spectra) 71.20.-b (Electron density of states and band structure of crystalline solids)

刘艳, 赵建洲, 俞理, 林成天, 胡成, 刘德发, 彭莹莹, 谢卓晋, 何俊峰, 陈朝宇, 冯娅, 伊合绵, 刘旭, 赵林, 何少龙, 刘国东, 董晓莉, 张君, 陈创天, 许祖彦, 翁虹明, 戴希, 方忠, 周兴江. Electronic structure of transition metal dichalcogenides PdTe₂ and Cu_0.05PdTe₂ superconductors obtained by angle-resolved photoemission spectroscopy[J]. 中国物理B, 2015, 24(6): 67401-067401.

Liu Yan (刘艳), Zhao Jian-Zhou (赵建洲), Yu Li (俞理), Lin Cheng-Tian (林成天), Hu Cheng (胡成), Liu De-Fa (刘德发), Peng Ying-Ying (彭莹莹), Xie Zhuo-Jin (谢卓晋), He Jun-Feng (何俊峰), Chen Chao-Yu (陈朝宇), Feng Ya (冯娅), Yi He-Mian (伊合绵), Liu Xu (刘旭), Zhao Lin (赵林), He Shao-Long (何少龙), Liu Guo-Dong (刘国东), Dong Xiao-Li (董晓莉), Zhang Jun (张君), Chen Chuang-Tian (陈创天), Xu Zu-Yan (许祖彦), Weng Hong-Ming (翁虹明), Dai Xi (戴希), Fang Zhong (方忠), Zhou Xing-Jiang (周兴江). Electronic structure of transition metal dichalcogenides PdTe₂ and Cu_0.05PdTe₂ superconductors obtained by angle-resolved photoemission spectroscopy[J]. Chin. Phys. B, 2015, 24(6): 67401-067401.

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Electronic structure of transition metal dichalcogenides PdTe₂ and Cu_0.05PdTe₂ superconductors obtained by angle-resolved photoemission spectroscopy

Electronic structure of transition metal dichalcogenides PdTe₂ and Cu_0.05PdTe₂ superconductors obtained by angle-resolved photoemission spectroscopy

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