Kondo interaction in FeTe and its potential role in the magnetic order.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37438375.
- Also identified by DOI 10.1038/s41467-023-39827-1 and PMC identifier 10338437.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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<sub>xy</sub> and itinerant Te 5p<sub>z</sub> orbitals. Our observations strongly suggest unusual cooperation between Kondo lattice behavior and long-range magnetic order.