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Title: Fermi surface topology and hot spot distribution in the Kondo lattice system CeB6

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. Here 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. Lastly, 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.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [3] ;  [10]
  1. Princeton Univ., NJ (United States). Dept. of Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Princeton Univ., NJ (United States). Dept. of Physics
  3. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  4. National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Physics
  5. National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Physics; Academia Sinica, Taipei (Taiwan)
  6. Temple Univ., Philadelphia, PA (United States). Dept. of Physics
  7. National Univ. of Singapore (Singapore). Graphene Research Centre, Dept. of Physics
  8. Northeastern Univ., Boston, MA (United States). Dept. of Physics
  9. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  10. Princeton Univ., NJ (United States). Dept. of Physics; Princeton Univ., NJ (United States). Princeton Center for Complex Materials
Publication Date:
OSTI Identifier:
1334118
Report Number(s):
LA-UR--15-26954
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
AC52-06NA25396; FG02-07ER46352; FG02-01ER45872; AC02-05CH11231; NRF-NRFF2013-03; GBMF4547;
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 10; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USNSF; National Science Council, Taiwan
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE