Approaching Quantum Criticality in ferromagnetic Ce2 (Pd1-x Rhx)2 In alloys
Abstract
Low temperature magnetic and thermal (Cm) properties of the ferromagnetic (FM) alloys Ce2.15 (Pd1-x Rhx)1.95 In0.9 were investigated in order to explore the possibility for tuning a quantum critical point (QCP) by doping Pd with Rh. As expected, the magnetic transition observed at T = 4.1K in the parent alloy decreases with increasing Rh concentration. Nevertheless it splits into two transitions, the upper being antiferromagnetic (AF) whereas the lower FM. The AF phase boundary extrapolates to TN = 0 for xcr ~ 0.65 whereas the first order FM transition vanishes at x ~ 0.3. The QC character of the TN => 0 point arises from the divergent T dependence of the tail of Cm/T observed in the x = 0.5 and 0.55 alloys, and the tendency to saturation of the maximum of Cm(TN)/T as observed in exemplary Ce compounds for TN => 0. Beyond the critical concentration the unit cell volume deviates from the Vegard's law in coincidence with a strong increase of the Kondo temperature.
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