Electronic structure of transition metal dichalcogenides PdTe2 and Cuo.05PdTe2 superconductors obtained by angle-resolved photoemission spectroscopy
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 exoti...
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| Published in | 中国物理B：英文版 no. 6; pp. 100 - 108 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-1056 2058-3834 |
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| Summary: | 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, Cuo.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 mecha- nism. Here we report systematic high resolution angle-resolved photoemission （ARPES） studies on PdTe2 and Cuo.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 Cuo.05PdTe2. Our results lay a foundation for further exploration and investigation on PdTe2 and related superconductors. |
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| Bibliography: | 11-5639/O4 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, Cuo.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 mecha- nism. Here we report systematic high resolution angle-resolved photoemission （ARPES） studies on PdTe2 and Cuo.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 Cuo.05PdTe2. Our results lay a foundation for further exploration and investigation on PdTe2 and related superconductors. transition metal dichalcogenides, PdTe2, superconductor, photoemission Liu Yan, Zhao Jian-Zhou, Yu Li Liu De-Fa, Peng Ying-Ying, Lin Cheng-Tian, Hu Cheng, Xie Zhuo-Jin, He Jun-Feng, Chen Chao-Yu, Feng Ya, Yi He-Mian Liu Xu, Zhao Lin, He Shao-Long, Liu Guo-Dong, Dong Xiao-Li, Zhang Jun, Chen Chuang-Tian, Xu Zu-Yan, Weng Hong-Ming, Dai Xi, Fang Zhong, and Zhou Xing-Jiang （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 FOr FestkOrperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany c） Technical Institute of Physics and ChemistrT, Chinese Academy of Sciences, Beijing 100190, China d） Collaborative Innovation Center of Quantum Matter, Beijing 100871, China |
| ISSN: | 1674-1056 2058-3834 |