Fermi Surface Topology and Hotspots Distribution in Kondo Lattice System   CeB6
  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-shape pockets around the X points of the Brillouin zone, while the states around the zone centre 'Gamma' point are strongly renormalized. Our first-principles calculations agree with data around the X points, but not at the 'Gamma' points, indicating areas of strong renormalization located around 'Gamma'. The Ce quasi-particle states participate in formation of hotspots at the Fermi surface, while the incoherent f states hybridize and lead to the emergence of dispersive features absent in non-f counterpart BaB6. These experimental and theoretical results provide a new understanding of rare-earth hexaboride materials. 
Madhab Neupane, Nasser Alidoust, Guang Bian, Su-Yang Xu, Ilya   Belopolski, Dae-Jeong Kim, Pavel P. Shibayev, Daniel S. Sanc...
cond-mat.str-el