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

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

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Abstract

Rare-earth hexaborides have attracted considerable attention recently in connection to a variety of correlated phenomena including heavy fermions, superconductivity, and low-temperature magnetic 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, whereas 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 quasiparticle states participate in the formation of hot spots at the Fermi surface, whereas the incoherent f states hybridize and lead to the emergence of dispersive features absent in the non-f counterpart BaB6. Our results provide an 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.

Original languageEnglish (US)
Article number104420
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number10
DOIs
StatePublished - Sep 18 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Neupane, M., Alidoust, N., Belopolski, I., Bian, G., Xu, S. Y., Kim, D. J., Shibayev, P. P., Sanchez, D. S., Zheng, H., Chang, T. R., Jeng, H. T., Riseborough, P. S., Lin, H., Bansil, A., Durakiewicz, T., Fisk, Z., & Hasan, M. Z. (2015). Fermi surface topology and hot spot distribution in the Kondo lattice system CeB 6. Physical Review B - Condensed Matter and Materials Physics, 92(10), [104420]. https://doi.org/10.1103/PhysRevB.92.104420