Mechanism of Field Induced Fermi Liquid State in Yb-Based Heavy-Fermion Compound: X-ray Absorption Spectroscopy and Nuclear Magnetic Resonance Studies of YbCo2Zn20

作者：Mito Takeshi^*; Koyama Takehide; Nakagawara Keitaro; Ishida Takuma; Ueda Koichi; Kohara Takao; Matsubayashi Kazuyuki; Saiga Yuta; Munakata Koji; Uwatoko Yoshiya; Mizumaki Masaichiro; Kawamura Naomi; Idzikowski Bogdan; Reiffers Marian

来源：Journal of the Physical Society of Japan, 2012, 81(3): 033706.

DOI：10.1143/JPSJ.81.033706

• ytterbium
• heavy-fermion
• YbCo2Zn20
• magnetic field
• valence
• NMR
• XAS

We have investigated the field dependences of Yb valence as well as of the magnetic properties of the heavy-fermion (HF) compound YbCo2Zn20 by X-ray absorption spectroscopy, Co-59 nuclear magnetic resonance, and magnetization measurements. Our results clearly show that the mechanism of field-induced Fermi-liquid-like behavior does not involve variation in the Yb electronic configuration, and is of magnetic origin. Typical examples of the susceptibility for several Yb-based HF materials are presented, in which one can see systematic changes between localized and delocalized pictures of 4f electrons.

• 出版日期2012-3