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Condensed Matter > Strongly Correlated Electrons
Title: Spin-polarized imaging of strongly interacting fermions in the ferrimagnetic state of Weyl candidate CeBi
(Submitted on 29 Dec 2020 (v1), last revised 9 Apr 2022 (this version, v2))
Abstract: CeBi has an intricate magnetic phase diagram whose fully-polarized state has recently been suggested as a Weyl semimetal, though the role of $f$ states in promoting strong interactions has remained elusive. Here we focus on the less-studied, but also time-reversal symmetry-breaking ferrimagnetic phase of CeBi, where our density functional theory (DFT) calculations predict additional Weyl nodes near the Fermi level $E_\mathrm{F}$. We use spin-polarized scanning tunneling microscopy and spectroscopy to image the surface ferrimagnetic order on the itinerant Bi $p$ states, indicating their orbital hybridization with localized Ce $f$ states. We observe suppression of this spin-polarized signature at $E_\mathrm{F}$, coincident with a Fano line shape in the conductance spectra, suggesting the Bi $p$ states partially Kondo screen the $f$ magnetic moments, and this $p-f$ hybridization causes strong Fermi-level band renormalization. The $p$ band flattening is supported by our quasiparticle interference (QPI) measurements, which also show band splitting in agreement with DFT, painting a consistent picture of a strongly interacting magnetic Weyl semimetal.
Submission history
From: Christian Matt [view email][v1] Tue, 29 Dec 2020 19:10:35 GMT (5446kb,D)
[v2] Sat, 9 Apr 2022 13:06:56 GMT (6143kb,D)
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