Direct observation of how the heavy-fermion state develops in 
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Chen, Qiuyun; Xu, D. F.; Niu, X. H.; Jiang, Jingwei; Peng, Rui; Xu, H. C.; Wen, Chenhaoping; Ding, Z. F.; Huang, Kevin; Shu, Lei; Zhang, Y. J.; Lee, H.; Strocov, Vladimir N.; Shi, M.; Bisti, F.; Schmitt, Thorsten; Huang, Yaobo; Dudin, Pavel; Lai, Xinchun; Kirchner, Stefan; Yuan, H. Q.; Feng, D. L.

doi:10.1103/physrevb.96.045107

Cited by 105 publications

(84 citation statements)

References 52 publications

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“…We found a nearly flat band at the Γ point at low temperatures. Bands away from the Γ point have no flat character, indicating the Ce 4f-electron contribution appears mainly around the Γ point, which is similar with other cerium based heavy-fermion compounds [17][18][19]. We found that Ce2IrIn8 has a similar band structure with the CeMIn5 (M = Co, Rh, Ir) compounds near the Fermi level: hole pockets around the Γ point and electron pockets…”

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confidence: 76%

“…If we add the contributions from the α, β electron pockets, we may get similar value 0.2±0.05 in CeCoIn5. [17] CONCLUSIONS To summarize, we performed high-resolution on-resonant temperature dependent study on the heavy-fermion compound Ce2IrIn8 across the coherent temperature. We found a nearly flat band near the Fermi level around the Γ point showing no big difference in kF, which seems to challenge the small-to-large Fermi surface scenario in the heavy-fermion compounds.…”

Section: Resultsmentioning

confidence: 99%

“…ARPES is a powerful tool to directly measure the electronic structure and Fermi surface of solid state materials. Especially, resonant ARPES with photon energies near 120 eV has been proved to be effective in tracing subtle changes of the 4f electrons in the Ce-based heavy-fermion compounds [17][18][19]. However, systematic ARPES research on the electronic structure of Ce2IrIn8 is still lacking to reveal the hybridization process in its ground state.In this paper, we performed a systematic electronic structure study on Ce2IrIn8 using ARPES measurements and DFT+DMFT calculations to investigate the localized/itinerant nature of the f electrons in its ground state.…”

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confidence: 99%

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Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce₂IrIn₈*

Liu¹,

Xu²,

Zhong³

et al. 2019

Chinese Phys. Lett.

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We utilized high-resolution resonant angle-resolved photoemission spectroscopy (ARPES) to study the band structure and hybridization effect of the heavy-fermion compound Ce2IrIn8. We observe a nearly flat band at the binding energy of 7 meV below the coherent temperature Tcoh~40 K, which characterizes the electrical resistance maximum indicating the onset temperature of hybridization. However, the Fermi vector kF and the Fermi surface (FS) volume have little change around Tcoh, challenging the widely believed evolution from a high-temperature small FS to a low-temperature large FS. Our experimental results of the band structure fit well with the density functional theory plus dynamic mean-field theory (DFT+DMFT) calculations. INTRODUCTION:Heavy-fermion compounds, first discovered in CeAl3 in 1975 [1], are some of the most exotic materials in condensed matter physics. The name originates from the largely enhanced effective mass of the heavy quasi-particles, which can be 2 or 3 orders of magnitude higher than that in a normal metal [2]. These compounds usually contain some of Ce, Sm, Yb, U, Pr, Pu, Np elements, which possess an unfilled 4f or 5f shell. It is widely believed that 4f/5f electrons are local moments at high temperatures and become itinerant after hybridized with the conduction electrons at low temperatures. Varieties of phenomena, e.g., antiferromagnetism [3], ferromagnetism [4], superconductivity [5], quantum critical point [6], quadrupole order [7], hidden order [8-9], topological property [10], have been discovered in heavy-fermion compounds. Central to understanding these exotic phenomena is the interplay of itinerancy and localization. However, the low energy scales (critical temperature, hybridization gap, superconducting gap) in heavy-fermion systems have brought major challenges to many experimental techniques.CemTnIn3m+2n (m = 1, 2; n = 1, 2 and T: Co, Rh, Ir, Pd, Pt) family is a good platform of heavy-fermion materials for studying the interplay between c-f hybridization, magnetism, superconductivity, quantum criticality, and etc. CemTnIn3m+2n crystallizes with a tetragonal unit cell that can be viewed as m-layers of CeIn3 unit stacked sequentially with intervening n-layers of TIn2 along the c-axis. Among them, the spin-glass state observed in Ce2IrIn8 indicates partially delocalized Ce 4f electron [11]. The magnetism in Ce2IrIn8 depends on Ce-Ir hybridization and local Ce environment. The small but finite onset temperature for spin freezing rules out the quantum critical point (QCP) scenario in Ce2IrIn8 [11]. High Sommerfeld coefficient (γ~700 mJ/mol‧K 2 ) [12] and the absence of long-range magnetic order indicate an itinerant behavior of Ce 4f electron. μSR observed a 'Knight-shift anomaly' in which the Knight shift constant K no longer scales linearly with the susceptibility below a characteristic temperature Tcoh, in agreement with the "two-fluid" model of heavy-fermion formation [15]. Resistivity measurements showed a broad maximum near 40 -50 K [13,16], manifesting the development of a...

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confidence: 76%

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce₂IrIn₈*

Liu¹,

Xu²,

Zhong³

et al. 2019

Chinese Phys. Lett.

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“…This reconciles, within a single experiment, the existence of a large Fermi volume at T T * K with vanishing Kondo weight at the QPT. Since this CEF-induced mechanism appears to be generic, we expect similar behavior of other Ce-and Yb-based heavy-fermion compounds [8,10,35,36] This supplement describes specifications of the experimental setup as well as the definition of the multi-orbital Anderson lattice model and details of the dynamical mean-field theory (DMFT) calculations with the non-crossing approximation (NCA) as the impurity solver.…”

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confidence: 94%

Fermi Volume Evolution and Crystal-Field Excitations in Heavy-Fermion Compounds Probed by Time-Domain Terahertz Spectroscopy

Pal

Wetli

Zamani³

et al. 2019

Phys. Rev. Lett.

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We measure the quasiparticle weight in the heavy-fermion compound CeCu6−xAux (x = 0, 0.1) by time-resolved terahertz spectroscopy for temperatures from 2 up to 300 K. This method distinguishes contributions from the heavy Kondo band and from the crystal-electric-field satellite bands by different terahertz response delay times. We find that the formation of heavy bands is controlled by an exponentially enhanced, high-energy Kondo scale once the crystal-electric-field states become thermally occupied. We corroborate these observations by temperature-dependent dynamical meanfield calculations for the multiorbital Anderson lattice model and discuss consequences for quantumcritical scenarios.arXiv:1810.07412v2 [cond-mat.str-el]

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“…To further quantitatively investigate the hybridization of conduction bands and f electrons, we zoom in the spectral feature around Γ in the vicinity of E F and then performed the PAM fitting, which has been proved an effective way to study the f electron behaviors [10,13]. Details of the band dispersion extraction and the PAM fitting can be found in the supplementary material [28].…”

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confidence: 99%

Electronic structure and 4f -electron character in Ce2PdIn8 studied by angle-resolved photoemission spectroscopy

et al. 2019

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The localized-to-itinerant transition of f electrons lies at the heart of heavy fermion physics, but has only been directly observed in single-layer Ce-based materials. Here we report a comprehensive study on the electronic structure and nature of the Ce 4 f electrons in the heavy fermion superconductor Ce 2 PdIn 8 , a typical n=2 Ce n M m In 3n+2m compound, using high-resolution and 4d-4 f resonant photoemission spectroscopies. The electronic structure of this material has been studied over a wide temperature range, and hybridization between f and conduction electrons can be clearly observed to form Kondo resonance near the Fermi level at low temperature. The characteristic temperature of the localized-to-itinerant transition is around 120 K, which is much higher than its coherence temperature T

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Direct observation of how the heavy-fermion state develops in CeCoIn5

Cited by 105 publications

References 52 publications

Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce₂IrIn₈*

Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce₂IrIn₈*

Fermi Volume Evolution and Crystal-Field Excitations in Heavy-Fermion Compounds Probed by Time-Domain Terahertz Spectroscopy

Electronic structure and 4f -electron character in Ce2PdIn8 studied by angle-resolved photoemission spectroscopy

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Direct observation of how the heavy-fermion state develops in CeCoIn5

Cited by 105 publications

References 52 publications

Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce2IrIn8*

Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce2IrIn8*

Fermi Volume Evolution and Crystal-Field Excitations in Heavy-Fermion Compounds Probed by Time-Domain Terahertz Spectroscopy

Electronic structure and 4f -electron character in Ce2PdIn8 studied by angle-resolved photoemission spectroscopy

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Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce₂IrIn₈*

Hybridization Effects Revealed by Angle-Resolved Photoemission Spectroscopy in Heavy-Fermion Ce₂IrIn₈*