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| Abstract |
We have studied the low temperature properties of Pr_{1-x}La_xPb_3 with the ground state of a non-Kramers $ Gamma_3 $ for $ 0 leq x leq 1 $. From the concentration dependence of the specific heat, the... quadrupolar ordeing, which is observed at $ T_Q=0.4 K $ in PrPb_3, is expected to occur only up to $ x sim 0.02 $. For a wide range of La concentration for $ 0.05 leq x leq 0.9 $ where the ordering is absent, the specific heat shows a T-linear variation below 0.5 K with a large coefficient, and can be almost reproduced by the model for amorphous materials with a random configuration of two level system. This means that the large $ C/T $ is responsible for the superpose of the Schottky specific heat due to splitting of the $ gamma_3 $ doublet by the distortion of CEF field. For $ x geq 0.95 $, $ C/T $ increases monotonically with decreasing temperature and can not be reproduced by the above model.show more
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teion03_p002