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

2015; American Physical Society; Volume: 92; Issue: 10 Linguagem: Inglês

10.1103/physrevb.92.104420

1550-235X

Madhab Neupane, Nasser Alidoust, Ilya Belopolski, Guang Bian, Su-Yang Xu, Dae-Jeong Kim, Pavel Shibayev, Daniel S. Sanchez, Hao Zheng, Tay‐Rong Chang, Horng‐Tay Jeng, Peter S. Riseborough, Hsin Lin, Arun Bansil, Tomasz Durakiewicz, Z. Fisk, M. Zahid Hasan,

Topological Materials and Phenomena

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.