Magnetic properties of CexLa1-xCu2.05Si2

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 Fara day and the torque method. For x < 0.1, magnetic response is found to be gi ven 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 ch i(Ce-mol)(x, T) = chi(ion)(T)/(1 + lambda(x)chi(ion)(T)), where lambda(x) i s the x-dependent constant, probably due to Ce-Ce interactions. The anisotr opy has a maximum at about 50 K and remains finite for T --> 0 for all x, r eflecting a strong CF influence. 1 1999 Elsevier Science B.V. All rights re served.