Electronic properties of Ce(Cu,Ga)/sub 2/

Ce(Cu/sub 1-x/Ga/sub x/)/sub 2/ compounds with x=0.0, 0.2, 0.4, 0.6, 0.75 and 1.0 were prepared and found to crystallize in the orthorhombic CeCu/sub 2/ structure up to the composition x=0.6, whereas for higher Ga content the hexagonal AlB/sub 2/ structure is formed. We report on specific-heat, electrical-resistivity and magnetic-susceptibility measurements. Furthermore, the specific heat was measured in magnetic fields up to 5 T and the development of the magnetic moments and the magnetocrystalline anisotropy were studied measuring the high-field magnetization in magnetic fields up to 35 T. For CeCu/sub 2/-based compounds, the high-field magnetization results reveal a decrease of the ordered moment with increasing Ga content, which can be understood in terms of an increased 4f-ligand hybridization. The strong magnetocrystalline anisotropy observed in all samples changes from uniaxial type for x/spl les/0.2 to multiaxial type for x>0.2. Specific-heat measurements reveal the temperatures of magnetic ordering first to decrease from 3.5 K for CeCu/sub 2/ to a temperature below 1.3 K for CeCu/sub 1.6/Ga/sub 0.4/ and then to increase again to 2.1 K for CeCu/sub 0.8/Ga/sub 1.2/. A development of Kondo-like behaviour was observed in the electrical resistivity.<
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