Abstract
We have measured the susceptibility and resistivity on single-crystalline Ce 1− y La y (Ru 0.85Rh 0.15) 2Si 2 along the tetragonal c-axis. The susceptibility increases with decreasing temperature, and then rapidly decreases, indicating the AF transition in each La concentration y. The resistivity also shows an anomaly in each La concentration y at around the T N. For y⩽0.1, we observe a jump in resistivity just below T N as is seen for Ce(Ru 0.85Rh 0.15) 2Si 2. This is interpreted in terms of the gap opening on the Fermi-surface along the c-axis. However, for y⩾0.2 the resistivity shows a downward bend at T N. These experimental facts suggest that the crossover from the spin density wave (SDW) with the gap opening to the localized AF order occurs at around y=0.1.
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