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; Changyoung Kim

doi:10.1038/s41467-023-39827-1

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

Nat Commun. 2023 Jul 12;14(1):4145. doi: 10.1038/s41467-023-39827-1.

Authors

Younsik Kim^{1

2}, Min-Seok Kim³, Dongwook Kim⁴, Minjae Kim⁵, Minsoo Kim^{1

2}, Cheng-Maw Cheng⁶, Joonyoung Choi⁷, Saegyeol Jung^{1

2}, Donghui Lu⁸, Jong Hyuk Kim⁹, Soohyun Cho¹⁰, Dongjoon Song^{1

2}, Dongjin Oh^{1

2

11}, Li Yu^{12

13

14}, Young Jai Choi⁹, Hyeong-Do Kim¹⁵, Jung Hoon Han¹⁶, Younjung Jo⁷, Ji Hoon Shim⁴, Jungpil Seo³, Soonsang Huh^{17

18}, Changyoung Kim^{19

20}

Affiliations

¹ Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, Korea.
² Department of Physics & Astronomy, Seoul National University, Seoul, 08826, Korea.
³ Department of Emerging Materials Science, DGIST, Daegu, 42988, Korea.
⁴ Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea.
⁵ Korea Institute for Advanced Study, Seoul, 02455, Korea.
⁶ National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan.
⁷ Department of Physics, Kyungpook National University, Daegu, 41566, Korea.
⁸ Stanford Synchrotron Radiation Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
⁹ Department of Physics, Yonsei University, Seoul, 03021, Korea.
¹⁰ Center for Excellence in Superconducting Electronics, State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 200050, Shanghai, China.
¹¹ Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
¹² Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.
¹³ School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, China.
¹⁴ Songshan Lake Materials Laboratory, 523808, Dongguan, Guangdong, China.
¹⁵ XFEL Beamline Division, Pohang Accelerator Laboratory, Pohang, 37673, Korea.
¹⁶ Department of Physics, Sungkyunkwan University, Suwon, 16419, Korea.
¹⁷ Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, Korea. sshuhss@gmail.com.
¹⁸ Department of Physics & Astronomy, Seoul National University, Seoul, 08826, Korea. sshuhss@gmail.com.
¹⁹ Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826, Korea. changyoung@snu.ac.kr.
²⁰ Department of Physics & Astronomy, Seoul National University, Seoul, 08826, Korea. changyoung@snu.ac.kr.

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 3d_xy and itinerant Te 5p_z orbitals. Our observations strongly suggest unusual cooperation between Kondo lattice behavior and long-range magnetic order.

Abstract

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