Fermi surface topology and hot spot distribution in the Kondo lattice system CeB 6
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Journal ArticleDate
2015-09-18Author
Neupane, MAlidoust, N
Belopolski, I
Bian, G
Xu, SY
Kim, DJ
Shibayev, PP
Sanchez, DS
Zheng, H
Chang, TR
Jeng, HT
Riseborough, PS
Lin, H
Bansil, A
Durakiewicz, T
Fisk, Z
Hasan, MZ
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http://hdl.handle.net/20.500.12613/5773
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10.1103/PhysRevB.92.104420Abstract
© 2015 American Physical Society. Rare-earth hexaborides have attracted considerable attention recently in connection to a variety of correlated phenomena including heavy fermions, superconductivity, and low-temperature magnetic phases. Here, we present high-resolution angle-resolved photoemission spectroscopy studies of trivalent CeB6 and divalent BaB6 rare-earth hexaborides. We find that the Fermi surface electronic structure of CeB6 consists of large oval-shaped pockets around the X points of the Brillouin zone, whereas the states around the zone center Γ point are strongly renormalized. Our first-principles calculations agree with our experimental results around the X points but not around the Γ point, indicating areas of strong renormalization located near Γ. The Ce quasiparticle states participate in the formation of hot spots at the Fermi surface, whereas the incoherent f states hybridize and lead to the emergence of dispersive features absent in the non-f counterpart BaB6. Our results provide an understanding of the electronic structure in rare-earth hexaborides, which will be useful in elucidating the nature of the exotic low-temperature phases in these materials.Citation to related work
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Physical Review B - Condensed Matter and Materials PhysicsADA compliance
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http://dx.doi.org/10.34944/dspace/5755