Magnetic properties around quantum critical point of CePt1-xRhx

Abstract In order to investigate magnetic properties around a quantum critical point of CePt 1 - x Rh x alloys, we have performed the ac-susceptibility ( χ ac ) measurements with field frequency ranging from ω / 2 π = 0 (dc magnetization) to 1113 Hz for temperature down to 100 mK on polycrystalline CePt 1 - x Rh x ( x = 0.5 , 0.6). The in-phase component of χ ac exhibits a pronounced peak at T f . The peak magnitude and T f show significant field-frequency dependence. In addition, a staircaselike hysteresis loop of magnetization was observed below 200 mK. From the dynamical analyses of χ ac , we suggest that CePt 0.5 Rh 0.5 and CePt 0.4 Rh 0.6 can be described as cluster-glass systems.