期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 29, 期 47, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/aa8b98
关键词
ferromagnetic heavy fermion; photoelectron spectroscopy; x-ray emission spectroscopy
资金
- Japan Society for the Promotion of Science [Kiban C 15K05194, 15K05190]
- Swiss National Foundation fellowship for prospective researchers [PBFRP2_140028]
- Grants-in-Aid for Scientific Research [15K05190, 26400322, 15K05194] Funding Source: KAKEN
- Swiss National Science Foundation (SNF) [PBFRP2_140028] Funding Source: Swiss National Science Foundation (SNF)
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 Yb3+ and small Yb2+ components. The magnitude of the Yb valence is evaluated to be YbPtGe < YbPdGe less than or similar to 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.
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