MU-SR STUDIES OF MAGNETIC CORRELATIONS IN PT AND CU DOPED CENISN

The development of magnetic correlations at low temperatures was studi ed by muon spin relaxation (mu SR) and specific heat measurements in C ePtxNi1-xSn (x = 0.12, 0.2) and CeCuxNi1-xSn (x = 0.05, 0.1, 0.2). Dop ing with Pt up to 20% increases the magnetic correlations only weakly. In contrast, doping with either 10% or 20% Cu strengthens the correla tions up to the point of forming a spin-glass-like state and finally l ong range order. The large difference in magnetic behavior between CeP txNi1-xSn and CeCuxNi1-xSn shows that the increase in d electron densi ty when doping with Cu is likely to be the important factor for streng thening magnetism.