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Large Fermi surface expansion through anisotropic mixing of conduction and f electrons in the semimetallic Kondo lattice CeBi

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Zitation

Li, P., Wu, Z., Wu, F., Guo, C., Liu, Y., Liu, H., et al. (2019). Large Fermi surface expansion through anisotropic mixing of conduction and f electrons in the semimetallic Kondo lattice CeBi. Physical Review B, 100(15): 155110, pp. 1-8. doi:10.1103/PhysRevB.100.155110.


Zitierlink: https://hdl.handle.net/21.11116/0000-0005-FB15-9
Zusammenfassung
Using angle-resolved photoemission spectroscopy (ARPES) and resonant ARPES, we report evidence of strong anisotropic conduction-f electron mixing (c-f mixing) in CeBi by observing a largely expanded Ce 5d pocket at low temperature, with no change in the Bi 6p bands. The anisotropic Fermi surface (FS) expansion is accompanied by a pronounced spectral weight transfer from the local 4f(0) peak of Ce (corresponding to Ce3+) to the itinerant conduction bands near the Fermi level. Careful analysis suggests that the observed large FS change (with a volume expansion of the electron pocket up to 40%) can most naturally be explained by a small valence change (similar to 1%) of Ce, which coexists with a very weak Kondo screening. Our work therefore provides evidence for a FS change driven by real charge fluctuations deep in the Kondo limit, which is highly dependent on the orbital character and momentum and is made possible by the low carrier density.