High Pressure Properties for Electrical Resistivity and Ce Valence State of Heavy-Fermion Antiferromagnet Ce2NiGa12

27th International Conference on Low Temperature Physics

Kawamura, N.^1 ; Sasaki, R.^2 ; Matsubayashi, K.^2 ; Ishimatsu, N.^3 ; Mizumaki, M.^1 ; Uwatoko, Y.^2 ; Ohara, S.^4 ; Watanabe, S.^5

Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo

679-5198, Japan^1

Institute for Solid State Physics, University of Tokyo, Chiba, Kashiwa

277-8581, Japan^2

Department of Physics, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima

739-8526, Japan^3

Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa, Aichi, Nagoya

466-8555, Japan^4

Quantum Physics Section, Kyushu Institute of Technology, 1-1 Sensui, Tobata, Fukuoka, Kitakyushu

804-8550, Japan^5

关键词: Antiferromagnetic orderings;    Antiferromagnets;    Applying pressure;    Critical phenomenon;    Electrical resistivity measurements;    Heavy fermion;    Quantum critical phenomena;    Strongly connected;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/4/042015/pdf
DOI  :  10.1088/1742-6596/568/4/042015

来源: IOP

【 摘 要 】

A heavy-fermion antiferromagnet Ce2NiGa12has been studied at a viewpoint of pressure effects. Electrical resistivity measurements show that the antiferromagnetic ordering is suppressed at PC∼ 5.5 GPa, and that Fermi liquid behaviour is observed above PC. To investigate how Ce valence state is associated with the observed critical phenomena, X-ray absorption spectra at Ce L3-edge have been performed. Ce valence state drastically varies at Pv∼ 9 GPa in the initial applying pressure process, whereas anomalous behaviour is not observed in the Ce valence under pressures around PC. Consequently, the quantum critical phenomena in Ce2NiGa12around PCis not strongly connected with Ce valence state.