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Fermi surface topology and hot spot distribution in the Kondo lattice system CeB 6

  • Author(s): Neupane, M
  • Alidoust, 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
  • et al.
Abstract

© 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.

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