Correlation-driven electronic reconstruction in FeTe1−xSex

Huang, Jianwei; Yu, Rong; Xu, Zhijun; Zhu, Jian‐Xin; Oh, Ji Seop; Jiang, Qianni; Wang, Meng; Wu, Han‐Qing; Chen, Tong; Denlinger, Jonathan D.; Mo, S.-K.; Hashimoto, M.; Michiardi, Matteo; Pedersen, Tor; Gorovikov, Sergey; Zhdanovich, Sergey; Damascelli, A.; Gu, Genda; Dai, Pengcheng; Chu, Jiun‐Haw; Lu, D. H.; Si, Qimiao; Birgeneau, R. J.; Yi, Ming

doi:10.1038/s42005-022-00805-6

Cited by 26 publications

(12 citation statements)

References 75 publications

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“…In Fe 1+y Te 1−x Se x , angle-resolved photoemission spectroscopy (ARPES) revealed a strong loss of spectral weight of the d xy orbital at high temperatures, which was interpreted in terms of proximity to an orbital-selective Mott transition 35 . Similar drastic changes were also observed as a function of doping 36,37 , mimicking the evolution of spin fluctuations. Nevertheless, the impact of orbital incoherence on nematicity remains little explored 38 .…”

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confidence: 64%

Nematic fluctuations in an orbital selective superconductor Fe1+yTe1−xSex

et al. 2023

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Fe1+yTe1−xSex is characterized by its complex magnetic phase diagram and highly orbital-dependent band renormalization. Despite this, the behavior of nematicity and nematic fluctuations, especially for high tellurium concentrations, remains largely unknown. Here we present a study of both B1g and B2g nematic fluctuations in Fe1+yTe1−xSex (0 ≤ x ≤ 0.53) using the technique of elastoresistivity measurement. We discovered that the nematic fluctuations in two symmetry channels are closely linked to the corresponding spin fluctuations, confirming the intertwined nature of these two degrees of freedom. We also revealed an unusual temperature dependence of the nematic susceptibility, which we attributed to a loss of coherence of the dxy orbital. Our results highlight the importance of orbital differentiation on the nematic properties of iron-based materials.

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confidence: 64%

Nematic fluctuations in an orbital selective superconductor Fe1+yTe1−xSex

et al. 2023

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“…This aspect of the crystal structure leads to localization of the Fe 3d xy band as the d xy orbital is confined in the Fe plane 13 , 19 . A recent ARPES study showed a complete loss of coherent spectral weight in the d xy band in FeTe, indicating a strong localization in the band 14 , 20 . The magnetic ground state of FeTe is bicollinear antiferromagnetism (BAFM) as shown in Fig.…”

Section: Resultsmentioning

confidence: 95%

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

Younsik

Kim

et al. 2023

Nat Commun

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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.

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“…The latter allows for the understanding of the existing and emerging strange-metal properties of flat-band systems. Our work also connects the topological flat band systems to the orbital-selective physics of bulk correlated materials ( 28 – 30 ), in which the atomic orbitals exhibit different dispersions and yet [in contrast to models with fully decoupled orbitals ( 31 )] are kinetically coupled with each other.…”

Section: Introductionmentioning

confidence: 99%

Coupled topological flat and wide bands: Quasiparticle formation and destruction

2023

Sci. Adv.

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Flat bands amplify correlation effects and are of extensive current interest. They provide a platform to explore both topology in correlated settings and correlation physics enriched by topology. Recent experiments in correlated kagome metals have found evidence for strange-metal behavior. A major theoretical challenge is to study the effect of local Coulomb repulsion when the band topology obstructs a real-space description. In a variant to the kagome lattice, we identify an orbital-selective Mott transition in any system of coupled topological flat and wide bands. This was made possible by the construction of exponentially localized and Kramers-doublet Wannier functions, which, in turn, leads to an effective Kondo-lattice description. Our findings show how quasiparticles are formed in such coupled topological flat-wide band systems and, equally important, how they are destroyed. Our work provides a conceptual framework for the understanding of the existing and emerging strange-metal properties in kagome metals and beyond.

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Correlation-driven electronic reconstruction in FeTe1−xSex

Cited by 26 publications

References 75 publications

Nematic fluctuations in an orbital selective superconductor Fe1+yTe1−xSex

Nematic fluctuations in an orbital selective superconductor Fe1+yTe1−xSex

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

Coupled topological flat and wide bands: Quasiparticle formation and destruction

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