J. Phys. Soc. Jpn. 80, SA094 (2011) [3 Pages]
Proceedings of the International Conference on Heavy Electrons 2010 (ICHE2010)

Effects of Magnetic Field, Pressure and Dilution of Yb on Phase Transitions in Valence Fluctuating Compound YbPd

+ Affiliations
1Department of Physics, Kyushu University, Fukuoka 812-8581, Japan2Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan

High field magnetization, pressure effect on electrical resistivity and dilution of Yb with Lu were examined for YbPd. The high field magnetization suggests that half of Yb ions have magnetic moments between 50 K and 115 K up to 55 T. The phase transition temperatures, T 1 and T 2 , which are observed under ambient pressure at 125 and 105 K, respectively, decrease with increasing pressure and the transitions disappear at around 4 GPa. This indicates that the valence fluctuating state above T 1 and T 2 becomes stable down to zero temperature above 4 GPa. Substitution of Lu for Yb also leads to depression of T 1 and T 2 , which is possibly caused by disturbing the periodicity of Yb ions. These results suggest that the valence ordered state of Yb ions is realized in YbPd below T 1 or T 2 .

©2011 The Physical Society of Japan

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