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Title: Electronic structure of ferromagnetic heavy fermion, YbPdSi, YbPdGe, and YbPtGe studied by photoelectron spectroscopy, x-ray emission spectroscopy, and DFT + DMFT calculations

Here, the electronic structures of ferromagnetic heavy fermion Yb compounds of YbPdSi, YbPdGe, and YbPtGe are studied by photoelectron spectroscopy around the Yb 4d–4f resonance, resonant x-ray emission spectroscopy at the Yb L 3 absorption edge, and density functional theory combined with dynamical mean field theory calculations. These compounds all have a temperature-independent intermediate Yb valence with large $${\rm Yb}^{3+}$$ and small $${\rm Yb}^{2+}$$ components. The magnitude of the Yb valence is evaluated to be YbPtGe $<$ YbPdGe $$\lesssim $$ YbPdSi, suggesting that YbPtGe is the closest to the quantum critical point among the three Yb compounds. Our results support the scenario of the coexistence of heavy fermion behavior and ferromagnetic ordering which is described by a magnetically-ordered Kondo lattice where the magnitude of the Kondo effect and the RKKY interaction are comparable.
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [6] ;  [8] ;  [9] ;  [9] ;  [9] ;  [5]
  1. RIKEN SPring-8 Center (RSC), Sayo (Japan)
  2. Uppsala Univ. (Sweden). Dept. of Physics and Astronomy
  3. National Inst. for Materials Science (NIMS), Tsukuba (Japan). International Center for Materials Nanoarchitectonics (MANA)
  4. National Defense Academy of Japan, Yokosuka (Japan). Dept. of Applied Physics
  5. Kwansei Gakuin Univ., Sanda (Japan). Graduate School of Science and Technology
  6. Hiroshima Univ. (Japan). Hiroshima Synchrotron Radiation Center
  7. Hiroshima Univ. (Japan). Hiroshima Synchrotron Radiation Center; Diamond Light Source, Oxfordshire (United Kingdom)
  8. Brookhaven National Lab. (BNL), Upton, NY (United States). Photon Sciences Directorate
  9. National Synchrotron Radiation Research Center (NSRRC), Hsinchu (Taiwan)
Publication Date:
Report Number(s):
Journal ID: ISSN 0953-8984
Grant/Contract Number:
SC0012704; Kiban C 15K05194; Kiban C 15K05190; PBFRP2_140028
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 29; Journal Issue: 47; Journal ID: ISSN 0953-8984
IOP Publishing
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Hiroshima Univ. (Japan); Japan Society for the Promotion of Science (JSPS); Swiss National Science Foundation (SNF)
Country of Publication:
United States
36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION; 43 PARTICLE ACCELERATORS; ferromagnetic heavy fermion; photoelectron spectroscopy; x-ray emission spectroscopy
OSTI Identifier: