Abstract
The existence of a new phase CePb2 has been confirmed by X-ray diffraction and SEMEDX analysis. The magnetic properties, low-temperature specific heat and electrical resistivity of this compound have been investigated. The crystal structure has been identified to be a body-centred tetragonal structure with a=3.317 AA and c=16.187 AA. Its magnetic state is antiferromagnetic with the Neel temperature TN=3.6 K. A linear extrapolation above TN of the C/T versus T2 plot gives a high electronic specific heat coefficient of 210 mJ (mol Ce)-1 K-2. The magnetic entropy is reduced to 68% of the theoretical value, indicating itinerancy of some of the 4f electrons. Furthermore, the magnetic contribution to the resistivity shows a negative logarithmic temperature dependence in a wide temperature range in connection with the Kondo system. From these results it is concluded that the present new phase CePb2 is an antiferromagnetic heavy-fermion system with the Neel temperature TN=3.6 K.
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