Valence State in Ce-based Heavy Fermion Compounds at High Magnetic Fields

Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa,Chiba 277-8581, Japan Center for General Education, Chang Gung University, Taoyuan County 333, Taiwan Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan Condensed Matter Science Division, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148, Japan 5Department of Physics, Faculty of Science, Shizuoka University, Shizuoka 422-8529, Japan Department of Physics, Hokkaido University, Sapporo 060-0810, Japan

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