| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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The 4$f$-Hybridization Strength in Ce$_m$$M$$_n$In$_{3m+2n}$ Heavy-Fermion Compounds Studied by Angle-Resolved Photoemission Spectroscopy |
| Jiao-Jiao Song1, Yang Luo1, Chen Zhang1, Qi-Yi Wu1, Tomasz Durakiewicz2, Yasmine Sassa3,4, Oscar Tjernberg5, Martin Månsson5, Magnus H. Berntsen5, Yin-Zou Zhao1, Hao Liu1, Shuang-Xing Zhu1, Zi-Teng Liu1, Fan-Ying Wu1, Shu-Yu Liu1, Eric D. Bauer6, Ján Rusz3, Peter M. Oppeneer3, Ya-Hua Yuan1, Yu-Xia Duan1, and Jian-Qiao Meng1* |
1School of Physics and Electronics, Central South University, Changsha 410083, China
2Institute of Physics, Maria Curie Sklodowska University, 20-031 Lublin, Poland
3Department of Physics and Astronomy, Uppsala University, Box 516, S-75120 Uppsala, Sweden
4Department of Physics, Chalmers University of Technology, 41296 Göteborg, Sweden
5Department of Applied Physics, KTH Royal Institute of Technology, AlbaNova Universitetscentrum, 106 91 Stockholm, Sweden
6Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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| Cite this article: |
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Jiao-Jiao Song, Yang Luo, Chen Zhang et al 2021 Chin. Phys. Lett. 38 107402 |
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Abstract We systemically investigate the nature of Ce 4$f$ electrons in structurally layered heavy-fermion compounds Ce$_m$$M$$_n$In$_{3m+2n}$ (with $M$ = Co, Rh, Ir, and Pt, $m=1$, 2, $n=0$–2), at low temperature using on-resonance angle-resolved photoemission spectroscopy. Three heavy quasiparticle bands $f^0$, $f^1_{7/2}$ and $f^1_{5/2}$, are observed in all compounds, whereas their intensities and energy locations vary greatly with materials. The strong $f^0$ states imply that the localized electron behavior dominates the Ce 4$f$ states. The Ce 4$f$ electrons are partially hybridized with the conduction electrons, making them have the dual nature of localization and itinerancy. Our quantitative comparison reveals that the $f^1_{5/2}$–$f^0$ intensity ratio is more suitable to reflect the $4f$-state hybridization strength.
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Received: 20 August 2021
Editors Suggestion
Published: 26 September 2021
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| PACS: |
74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.70.Tx
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(Heavy-fermion superconductors)
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79.60.-i
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(Photoemission and photoelectron spectra)
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 12074436 and 11574402), and the Innovation-Driven Plan in Central South University (Grant No. 2016CXS032). J.R. and P.M.O. acknowledge support through the Swedish Research Council (VR) and the Swedish National Infrastructure for Computing (SNIC), for computing time on computer cluster Triolith at the NSC center Link?ping (supported by VR Grant No. 2018-05973). Y.S. acknowledges the support from the Swedish Research Council (VR) through a Starting Grant (No. Dnr. 2017-05078). O.T. acknowledges support from the Swedish Research Council (VR) and the Knut and Alice Wallenberg foundation. M.M. is partly supported by a Marie Sklodowska-Curie Action, International Career Grant through the European Commission and Swedish Research Council (VR) (Grant No. INCA-2014-6426), as well as a VR neutron project (Grant No. BIFROST, Dnr. 2016-06955). Further support was also granted by the Carl Tryggers Foundation for Scientific Research (Grant Nos. CTS-16:324 and CTS-17:325). Work at Los Alamos was performed under the auspices of the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering. |
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