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Magnetic properties of Ce_xLa_1-xCu_2.05Si_2

We investigated magnetic properties of CexLa1-xCu2.05Si2 for 0.01 less than or equal to x less than or equal to 1, between 2 and 340 K, using the Faraday and the torque method. For x < 0.1, magnetic response is found to be given by the single-ion contribution chi(ion)(T), which relates to the Kondo susceptibility of the 4f(1) multiplet split by the tetragonal crystal field (CF). For x greater than or equal to 0.1 the susceptibility is given by chi(Ce-mol)(x, T) = chi(ion)(T)/(1 + lambda(x)chi(ion)(T)), where lambda(x)is the x-dependent constant, probably due to Ce-Ce interactions. The anisotropy has a maximum at about 50 K and remains finite for T --> 0 for all x, reflecting a strong CF influence.

magnetic susceptibility; Kondo effect; crystal electric field

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