journal article·2021-03-11

Angle-resolved photoemission spectroscopy view on the nature of Ce 4f electrons in the antiferromagnetic Kondo lattice CePd5Al2

Ya-Hua Yuan, Yu-Xia Duan, Ján Rusz, Chen Zhang, Jiao-Jiao Song, Qi-Yi Wu, Yasmine Sassa, Oscar Tjernberg, Martin Månsson, Magnus H. Berntsen, Fan-Ying Wu, Shu-Yu Liu, Hao Liu, Shuang-Xing Zhu, Zi-Teng Liu, Yin-Zou Zhao, P. H. Tobash, Eric D. Bauer, Joe D. Thompson, Peter M. Oppeneer, Tomasz Durakiewicz, Jian-Qiao Meng

Physical Review B· Volume 103· Issue 12
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Abstract

We report an angle-resolved photoemission spectroscopy study of the antiferromagnetic Kondo lattice $\mathrm{Ce}{\mathrm{Pd}}5{\mathrm{Al}}2$, focusing on the quasi-two-dimensional $k$-space nature of its Fermi surface and, tuning photon energy to the Ce $4d--4f$ on-resonance transition, the hybridization of the Ce $4f$ state. A strong shoulder feature on the ${f}0$ peak was detected, suggesting hybridization between conduction and $f$ bands. On-resonance spectra revealed narrow, yet hybridized quasiparticle bands with sharp peaks and $\ensuremath{\sim}$ 9 meV energy dispersion near the Fermi energy ${E}F$. The observed dispersive hybridized $f$ band can be well described by a hybridization-band picture based on the periodic Anderson model (PAM). Hence, the $4f$ electrons in $\mathrm{Ce}{\mathrm{Pd}}5{\mathrm{Al}}2$ display a dual nature, with both localized and itinerant features, but with dominantly localized character.
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Research context

OpenAlex topics: Rare-earth and actinide compounds · Iron-based superconductors research · Inorganic Chemistry and Materials

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Affiliations

School of Physics and Electronics, Central South University, Changsha 410083, Hunan, People's Republic of China

Department of Physics and Astronomy, Uppsala University, Box 516, S-75120 Uppsala, Sweden

Department of Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden

Department of Applied Physics, KTH Royal Institute of Technology, Electrum 229, S-16440, Stockholm, Kista, Sweden

Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Institute of Physics, Maria Curie Sklodowska University, 20-031 Lublin, Poland

Funding

National Natural Science Foundation of China · Central South University · Vetenskapsrådet · Knut och Alice Wallenbergs Stiftelse · U.S. Department of Energy · Basic Energy Sciences

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