Fermi Surface Topology and Hotspots Distribution in Kondo Lattice System CeB6

TL;DR

This study uses high-resolution ARPES to explore the Fermi surface and electronic structure of CeB6, revealing renormalized states and hotspots related to f-electron hybridization, advancing understanding of rare-earth hexaborides.

Contribution

It provides detailed experimental and theoretical insights into the Fermi surface topology and electronic correlations in CeB6, highlighting areas of strong renormalization and the role of f-electron states.

Findings

Fermi surface consists of large oval pockets around X points

Strong renormalization of states around Gamma point

Formation of hotspots due to Ce quasi-particle states

Abstract

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.