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

Author(s): Neupane, Madhab; Alidoust, Nasser; Belopolski, Ilya; Bian, Guang; Xu, Su-Yang; et al

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Abstract: Rare-earth hexaborides have attracted a considerable attention recently in connection to variety of correlated phenomena including heavy fermions, superconductivity and low temperature mag- netic 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, while 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 quasi-particle states participate in the formation of hotspots at the Fermi surface, while the incoherent f states hybridize and lead to the emergence of dispersive features absent in the non-f counterpart BaB6. Our results provide a new 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.
Publication Date: Sep-2015
Electronic Publication Date: 18-Sep-2015
Citation: Neupane, Madhab, Alidoust, Nasser, Belopolski, Ilya, Bian, Guang, Xu, Su-Yang, Kim, Dae-Jeong, Shibayev, Pavel P, Sanchez, Daniel S, Zheng, Hao, Chang, Tay-Rong, Jeng, Horng-Tay, Riseborough, Peter S, Lin, Hsin, Bansil, Arun, Durakiewicz, Tomasz, Fisk, Zachary, Hasan, M Zahid. (2015). Fermi surface topology and hot spot distribution in the Kondo lattice system. Physical Review B, 92 (10), 10.1103/PhysRevB.92.104420
DOI: doi:10.1103/PhysRevB.92.104420
ISSN: 1098-0121
EISSN: 1550-235X
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Author's manuscript

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