Pressure-induced magnetic instability in Ce2Rh3Ge5 - art. no. 144412

A pressure-induced magnetic-nonmagnetic transition in an antiferromagnet Ce 2Rh3Ge5 has been investigated by the measurements of the resistivity rho, m agnetic susceptibility chi, and specific heat on a single crystal down to 0 .3 K. With increasing pressure, the Neel temperature T-N is suppressed and disappears at P-c = 0.45 GPa. For P>P-c, the deviation from the Fermi-liqui d behavior is observed in both rho (T) and chi (T): rho (T)=rho (o) +AT(n) (n congruent to1.45) and chi (T)=chi (0)-DTm (m congruent to0.27). Even for P>3P(c) both n and m hardly change, i.e., no recovery of the Fermi-liquid state. This fact is in contrast with the recovery in many of Ce-based antif erromagnets at P>2P(c). The magnetization hardly decreases with pressure up to 1.2 GPa, suggesting that the cerium local moments still remain even far from the quantum critical point. Moreover, the Kondo temperature T-K incre ases weakly from 10 K at P=0 to 13 K at P=0.57 GPa. These findings indicate the important role of short-range magnetic correlations in the revised Don iach phase diagram.