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Title: Kondo interactions from band reconstruction in YbInCu4

We combine resonant inelastic X-ray scattering (RIXS) and model calculations in the Kondo lattice compound YbInCu₄, a system characterized by a dramatic increase in Kondo temperature and associated valence fluctuations below a first-order valence transition at T≃42 K. In this study, the bulk-sensitive, element-specific, and valence-projected charge excitation spectra reveal an unusual quasi-gap in the Yb-derived state density which drives an instability of the electronic structure and renormalizes the low-energy effective Hamiltonian at the transition. Our results provide long-sought experimental evidence for a link between temperature-driven changes in the low-energy Kondo scale and the higher-energy electronic structure of this system.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [6] ;  [6] ;  [7]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. High Energy Accelerator Research Organization, Ibaraki (Japan)
  3. RIKEN SPring-8 Center, Hyogo (Japan)
  4. National Institute for Materials Science, Tsukuba (Japan)
  5. Japan Atomic Energy Agency, Hyogo (Japan)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Univ. of Connecticut, Storrs, CT (United States)
Publication Date:
OSTI Identifier:
1193213
Report Number(s):
BNL--108004-2015-JA
Journal ID: ISSN 0031-9007; PRLTAO; R&D Project: LS001
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 12; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE