The 4f-Hybridization Strength in Ce
                  m
               
               Mn
               In3m+2n
                Heavy-Fermion Compounds Studied by Angle-Resolved Photoemission Spectroscopy

We systemically investigate the nature of Ce 4f electrons in structurally layered heavy-fermion compounds Ce m M n In3m + 2n (with M = Co, Rh, Ir, and Pt, m = 1, 2, n = 0–2), at low temperature using on-resonance angle-resolved photoemission spectroscopy. Three heavy quasiparticle bands f 0, f 7 / 2 1 and f 5 / 2 1 , are observed in all compounds, whereas their intensities and energy locations vary greatly with materials. The strong f 0 states imply that the localized electron behavior dominates the Ce 4f states. The Ce 4f electrons are partially hybridized with the conduction electrons, making them have the dual nature of localization and itinerancy. Our quantitative comparison reveals that the f 5 / 2 1 –f 0 intensity ratio is more suitable to reflect the 4f-state hybridization strength.

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Possibility of Probing the Fermi Surface of a Heavy-Fermion System by Using Angle-Resolved Photoemission Spectroscopy

Journal of the Korean Physical Society ◽

10.3938/jkps.52.187 ◽

2008 ◽

Vol 52 (2) ◽

pp. 187-191 ◽

Cited By ~ 1

Author(s):

Hyeong-Do Kim

Keyword(s):

Fermi Surface ◽

Heavy Fermion ◽

Photoemission Spectroscopy ◽

Fermion System ◽

Heavy Fermion System ◽

Angle Resolved Photoemission Spectroscopy

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Direct visualization of coexisting channels of interaction in CeSb

Science Advances ◽

10.1126/sciadv.aat7158 ◽

2019 ◽

Vol 5 (3) ◽

pp. eaat7158 ◽

Cited By ~ 9

Author(s):

Sooyoung Jang ◽

Robert Kealhofer ◽

Caolan John ◽

Spencer Doyle ◽

Ji-Sook Hong ◽

...

Keyword(s):

Heavy Fermion ◽

Real Space ◽

Photoemission Spectroscopy ◽

Itinerant Electron ◽

Electron Systems ◽

Direct Visualization ◽

Correlated Electron Systems ◽

Angle Resolved Photoemission Spectroscopy ◽

Correlated Electron ◽

Modes Of Interaction

Our understanding of correlated electron systems is vexed by the complexity of their interactions. Heavy fermion compounds are archetypal examples of this physics, leading to exotic properties that weave magnetism, superconductivity and strange metal behavior together. The Kondo semimetal CeSb is an unusual example where different channels of interaction not only coexist, but have coincident physical signatures, leading to decades of debate about the microscopic picture describing the interactions between the f moments and the itinerant electron sea. Using angle-resolved photoemission spectroscopy, we resonantly enhance the response of the Ce f electrons across the magnetic transitions of CeSb and find there are two distinct modes of interaction that are simultaneously active, but on different kinds of carriers. This study reveals how correlated systems can reconcile the coexistence of different modes on interaction—by separating their action in momentum space, they allow their coexistence in real space.

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