Electronic structure study of the charge-density-wave Kondo lattice CeTe3

doi:10.1088/1674-1056/acb41e

中国物理B ›› 2023, Vol. 32 ›› Issue (9): 97103-097103.doi: 10.1088/1674-1056/acb41e

Electronic structure study of the charge-density-wave Kondo lattice CeTe₃

Bo Wang(王博)^†, Rui Zhou(周锐)^†, Xuebing Luo(罗学兵), Yun Zhang(张云)^‡, and Qiuyun Chen(陈秋云)^§

Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621907, China

收稿日期:2022-10-17 修回日期:2022-12-25 接受日期:2023-01-18 发布日期:2023-09-01
通讯作者: Yun Zhang, Qiuyun Chen E-mail:thu_zhangyun@126.com;sheqiuyun@126.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12122409, 11874330, 11904334, 12004349, and 11904335), the National Key Research and Development Program of China (Grants Nos. 2022YFA1402201 and 2021YFA1601100), and the BL03U and BL09U ARPES beam line of Shanghai Synchrotron Radiation Facility (SSRF, China).

Electronic structure study of the charge-density-wave Kondo lattice CeTe₃

Bo Wang(王博)^†, Rui Zhou(周锐)^†, Xuebing Luo(罗学兵), Yun Zhang(张云)^‡, and Qiuyun Chen(陈秋云)^§

Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621907, China

Received:2022-10-17 Revised:2022-12-25 Accepted:2023-01-18 Published:2023-09-01
Contact: Yun Zhang, Qiuyun Chen E-mail:thu_zhangyun@126.com;sheqiuyun@126.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12122409, 11874330, 11904334, 12004349, and 11904335), the National Key Research and Development Program of China (Grants Nos. 2022YFA1402201 and 2021YFA1601100), and the BL03U and BL09U ARPES beam line of Shanghai Synchrotron Radiation Facility (SSRF, China).

摘要/Abstract

摘要： The behaviors of m f electrons are crucial for understanding the rich phase diagrams and ground-state properties of heavy fermion (HF) systems. The complicated interactions between m f electrons and conduction electrons largely enrich the basic properties of HF compounds. Here the electronic structure, especially the m f-electron character, of the charge-density-wave (CDW) Kondo lattice compound CeTe₃ has been studied by high-resolution angle-resolved photoemission spectroscopy. A weakly dispersive quasiparticle band near the Fermi level has been observed directly, indicating hybridization between m f electrons and conduction electrons. Temperature-dependent measurements confirm the localized to itinerant transition of m f electrons as the temperature decreases. Furthermore, an energy gap formed by one conduction band at low temperature is gradually closed with increasing temperature, which probably originates from the CDW transition at extremely high temperature. Additionally, orbital information of different electrons has also been acquired with different photon energies and polarizations, which indicates the anisotropy and diverse symmetries of the orbitals. Our results may help understand the complicated m f-electron behaviors when considering its interaction with other electrons/photons in CeTe₃ and other related compounds.

关键词: 4f-electron, charge-density-wave, electronic structure, angle-resolved photoemission spectroscopy

Abstract: The behaviors of m f electrons are crucial for understanding the rich phase diagrams and ground-state properties of heavy fermion (HF) systems. The complicated interactions between m f electrons and conduction electrons largely enrich the basic properties of HF compounds. Here the electronic structure, especially the m f-electron character, of the charge-density-wave (CDW) Kondo lattice compound CeTe₃ has been studied by high-resolution angle-resolved photoemission spectroscopy. A weakly dispersive quasiparticle band near the Fermi level has been observed directly, indicating hybridization between m f electrons and conduction electrons. Temperature-dependent measurements confirm the localized to itinerant transition of m f electrons as the temperature decreases. Furthermore, an energy gap formed by one conduction band at low temperature is gradually closed with increasing temperature, which probably originates from the CDW transition at extremely high temperature. Additionally, orbital information of different electrons has also been acquired with different photon energies and polarizations, which indicates the anisotropy and diverse symmetries of the orbitals. Our results may help understand the complicated m f-electron behaviors when considering its interaction with other electrons/photons in CeTe₃ and other related compounds.

Key words: 4f-electron, charge-density-wave, electronic structure, angle-resolved photoemission spectroscopy

中图分类号: (Rare earth metals and alloys)

71.20.Eh

71.27.+a (Strongly correlated electron systems; heavy fermions) 79.60.-i (Photoemission and photoelectron spectra) 71.45.Lr (Charge-density-wave systems)

Bo Wang(王博), Rui Zhou(周锐), Xuebing Luo(罗学兵), Yun Zhang(张云), and Qiuyun Chen(陈秋云). Electronic structure study of the charge-density-wave Kondo lattice CeTe₃[J]. 中国物理B, 2023, 32(9): 97103-097103.

Bo Wang(王博), Rui Zhou(周锐), Xuebing Luo(罗学兵), Yun Zhang(张云), and Qiuyun Chen(陈秋云). Electronic structure study of the charge-density-wave Kondo lattice CeTe₃[J]. Chin. Phys. B, 2023, 32(9): 97103-097103.

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Electronic structure study of the charge-density-wave Kondo lattice CeTe₃

Electronic structure study of the charge-density-wave Kondo lattice CeTe₃

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