mu+SR study of heavy-fermion magnetism in Ce(Cu1-xNix)(2)Ge-2

We report muon spin relaxation (mu(+) SR) studies on the magnetic phase dia gram of Ce(Cu1-xNix)(2)Ge-2 polycrystals for 0.5 less than or equal to x le ss than or equal to 0.8. A sharp magnetic transition, evidenced by the appe arance of a fast Gaussian relaxation component sigma, has been observed in the x = 0.5 alloy at 4.0 K in zero applied field. The average local field [ B-mu] at the stopping sites of the muons, extracted from sigma, exhibits a linear temperature dependence. We associate these features with an incommen surate spin density wave (SDW) ordering. Magnetic ordering, either long ran ge or short range, and signatures of non-Fermi liquid behaviour have not be en observed down to 2.0 K at x = 0.8.