Electronic structure of ferromagnetic heavy fermion, YbPdSi, YbPdGe, and YbPtGe studied by photoelectron spectroscopy, x-ray emission spectroscopy, and DFT + DMFT calculations
- RIKEN SPring-8 Center (RSC), Sayo (Japan)
- Uppsala Univ. (Sweden). Dept. of Physics and Astronomy
- National Inst. for Materials Science (NIMS), Tsukuba (Japan). International Center for Materials Nanoarchitectonics (MANA)
- National Defense Academy of Japan, Yokosuka (Japan). Dept. of Applied Physics
- Kwansei Gakuin Univ., Sanda (Japan). Graduate School of Science and Technology
- Hiroshima Univ. (Japan). Hiroshima Synchrotron Radiation Center
- Hiroshima Univ. (Japan). Hiroshima Synchrotron Radiation Center; Diamond Light Source, Oxfordshire (United Kingdom)
- Brookhaven National Lab. (BNL), Upton, NY (United States). Photon Sciences Directorate
- National Synchrotron Radiation Research Center (NSRRC), Hsinchu (Taiwan)
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.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Hiroshima Univ. (Japan); Japan Society for the Promotion of Science (JSPS); Swiss National Science Foundation (SNF)
- Grant/Contract Number:
- SC0012704; Kiban C 15K05194; Kiban C 15K05190; PBFRP2_140028
- OSTI ID:
- 1433946
- Report Number(s):
- BNL-203459-2018-JAAM; TRN: US1802811
- Journal Information:
- Journal of Physics. Condensed Matter, Vol. 29, Issue 47; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Elastic anomalies under magnetic fields in the heavy-fermion ferromagnet YbPtGe
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journal | October 2018 |
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