Kondo interaction in FeTe and its potential role in the magnetic order

Younsik Kim, Min-Seok Kim, Dongwook Kim, Minjae Kim, Minsoo Kim, Cheng-Maw Cheng, Joonyoung Choi, Saegyeol Jung, Donghui Lu, Jong Hyuk Kim, Soohyun Cho, Dongjoon Song, Dongjin Oh, Li Yu, Young Jai Choi, Hyeong-Do Kim, Jung Hoon Han, Younjung Jo, Ji Hoon Shim, Jungpil Seo, Soonsang Huh () and Changyoung Kim ()
Additional contact information
Younsik Kim: Institute for Basic Science
Min-Seok Kim: DGIST
Dongwook Kim: Pohang University of Science and Technology (POSTECH)
Minjae Kim: Korea Institute for Advanced Study
Minsoo Kim: Institute for Basic Science
Cheng-Maw Cheng: National Synchrotron Radiation Research Center
Joonyoung Choi: Kyungpook National University
Saegyeol Jung: Institute for Basic Science
Donghui Lu: SLAC National Accelerator Laboratory
Jong Hyuk Kim: Yonsei University
Soohyun Cho: Chinese Academy of Sciences
Dongjoon Song: Institute for Basic Science
Dongjin Oh: Institute for Basic Science
Li Yu: Chinese Academy of Sciences
Young Jai Choi: Yonsei University
Hyeong-Do Kim: Pohang Accelerator Laboratory
Jung Hoon Han: Sungkyunkwan University
Younjung Jo: Kyungpook National University
Ji Hoon Shim: Pohang University of Science and Technology (POSTECH)
Jungpil Seo: DGIST
Soonsang Huh: Institute for Basic Science
Changyoung Kim: Institute for Basic Science

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Finding d-electron heavy fermion states has been an important topic as the diversity in d-electron materials can lead to many exotic Kondo effect-related phenomena or new states of matter such as correlation-driven topological Kondo insulator. Yet, obtaining direct spectroscopic evidence for a d-electron heavy fermion system has been elusive to date. Here, we report the observation of Kondo lattice behavior in an antiferromagnetic metal, FeTe, via angle-resolved photoemission spectroscopy, scanning tunneling spectroscopy and transport property measurements. The Kondo lattice behavior is represented by the emergence of a sharp quasiparticle and Fano-type tunneling spectra at low temperatures. The transport property measurements confirm the low-temperature Fermi liquid behavior and reveal successive coherent-incoherent crossover upon increasing temperature. We interpret the Kondo lattice behavior as a result of hybridization between localized Fe 3dxy and itinerant Te 5pz orbitals. Our observations strongly suggest unusual cooperation between Kondo lattice behavior and long-range magnetic order.

Date: 2023
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DOI: 10.1038/s41467-023-39827-1

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