Abstract
Temperature dependences of the specific heat, electrical resistivity and magnetic susceptibility of single-phased AlB 2-type compound Ce 2CuSi 3 as well as its nonmagnetic counterpart La 2CuSi 3 are reported. La 2CuSi 3 is Pauli paramagnetic whereas Ce 2CuSi 3 shows complex magnetic properties. An antiferromagnetic ordering at 2.1 k is observed by low field (50 Oe) susceptibility measurement on Ce 2CuSi 3. Magnetic susceptibility measured under 2000 Oe, however, appears to be saturated below 2.1 K. Heat capacity measurement down to 4.5 K reveals an upturn in C( T) of Ce 2CuSi 3 which could be correlated with magnetic transition at 2.1 K. The electronic specific heat in Ce 2CuSi 3 is obtained, indicating an enhanced temperature-independent γ of 76mJK −2 mol −1 Ce. A negative contribution to the enhanced γ that could be due to spin fluctuation, is observed. The resistivity data of Ce 2CuSi 3 shows the typical behavior of a Kondo compound, which might be responsible for the enhanced effective mass.
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