Chin. Phys. Lett.  2019, Vol. 36 Issue (9): 097101    DOI: 10.1088/0256-307X/36/9/097101
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce$_{2}$IrIn$_{8}$
Haijiang Liu1,2, Yuanji Xu1,2, Yigui Zhong1,2, Jianyu Guan1,2, Lingyuan Kong1,2, Junzhang Ma3, Yaobo Huang4, Qiuyun Chen5, Genfu Chen1,2, Ming Shi3, Yi-feng Yang1,2,6, Hong Ding1,2,6**
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2School of Physics, University of Chinese Academy of Sciences, Beijing 100190
3Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
4Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204
5Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621908
6Songshan Lake Materials Laboratory, Dongguan 523808
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Haijiang Liu, Yuanji Xu, Yigui Zhong et al  2019 Chin. Phys. Lett. 36 097101
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Abstract We utilize high-resolution resonant angle-resolved photoemission spectroscopy (ARPES) to study the band structure and hybridization effect of the heavy-fermion compound Ce$_{2}$IrIn$_{8}$. We observe a nearly flat band at the binding energy of 7 meV below the coherent temperature $T_{\rm coh}\sim 40$ K, which characterizes the electrical resistance maximum and indicates the onset temperature of hybridization. However, the Fermi vector and the Fermi surface volume have little change around $T_{\rm coh}$, which challenges the widely believed evolution from a high-temperature small Fermi surface to a low-temperature large Fermi surface. Our experimental results of the band structure fit well with the density functional theory plus dynamic mean-field theory calculations.
Received: 05 July 2019      Published: 23 August 2019
PACS:  71.27.+a (Strongly correlated electron systems; heavy fermions)  
  71.15.Mb (Density functional theory, local density approximation, gradient and other corrections)  
  31.15.E-  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/36/9/097101       OR      https://cpl.iphy.ac.cn/Y2019/V36/I9/097101
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Haijiang Liu
Yuanji Xu
Yigui Zhong
Jianyu Guan
Lingyuan Kong
Junzhang Ma
Yaobo Huang
Qiuyun Chen
Genfu Chen
Ming Shi
Yi-feng Yang
Hong Ding
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