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.
@article{arxiv.1411.0302,
title = {Fermi Surface Topology and Hotspots Distribution in Kondo Lattice System CeB6},
author = {Madhab Neupane and Nasser Alidoust and Guang Bian and Su-Yang Xu and Ilya Belopolski and Dae-Jeong Kim and Pavel P. Shibayev and Daniel S. Sanchez and Tay-Rong Chang and Horng-Tay Jeng and Peter S. Riseborough and Hsin Lin and Tomasz Durakiewicz and Arun Bansil and Zachary Fisk and M. Zahid Hasan},
journal= {arXiv preprint arXiv:1411.0302},
year = {2015}
}