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arXiv · 2203.06432

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

Younsik Kim·Minsoo Kim·Min-Seok 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·Jungpil Seo·Soonsang Huh·Changyoung Kim
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Abstract

Finding d-electron heavy fermion (HF) 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 or cooperation between long-range magnetism and Kondo lattice behavior. Yet, obtaining direct spectroscopic evidence for a d-electron HF 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 (ARPES) and transport properties measurements. The Kondo lattice behavior is represented by the emergence of a sharp quasiparticle 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 interpretation is further evidenced by Fano-type tunneling spectra which accompany a hybridization gap. Our observations strongly suggest unusual cooperation between Kondo lattice behavior and long-range magnetic order.

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Younsik Kim, Minsoo Kim, Min-Seok 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, Jungpil Seo, Soonsang Huh, Changyoung Kim. 2022-03-12. Kondo interaction in FeTe and its potential role in the magnetic order. https://doi.org/10.1038/s41467-023-39827-1

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