MAGNETIC-PROPERTIES AND PHASE-DIAGRAM OF CE(RU1-XRHX)2SI2 (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-0.5)

Magnetic susceptibility, magnetization and specific heat measurements have been performed on single crystalline Ce(Ru1-xRhx)2Si2 in the Ru rich region(0 less-than-or-equal-to x < 0.5) with a special interest in the small Rh substitution effects on the Kondo temperature T(K), the antiferromagnetic (AF) correlation and the metamagnetic transition in CeRu2Si2. Phase diagrams are obtained in both x-T and H-T planes with fields applied parallel to the tetragonal c-axis. At low Rh concentration, T(K) decreases with x and a weak AF ordering (T(N) less-than-or-equal-to 5.5 K) appears in the region 0.05 <x < 0. 30. The metamagnetic transition field H(M) decreases with x, leveling off and disappearing above x=0.20. This metamagnetic transition clearly exists in the AF ordered samples, where two successive transitions are observed in fields at H(C)(< 4 T) and H(M)(> 5 T). The AF ordering is destroyed above H(C) and the system further undergoes a metamagnetic transition at H(M).