Abstract
We have investigated the temperature-pressure phase diagram of the heavy fermion compound CeCoGe2.2Si0.8 by DC magnetic susceptibility measurements, χDC(T), under high pressure. The Néel temperature of TN = 4 K in zero pressure is reduced by pressure up to 3 kbar. At higher pressures antiferromagnetic order appears to gradually transform into a spin glass like-state. Magnetic field decreases both TN and the spin glass freezing temperature Tf. At 3 T and 6.5 kbar a divergence of χDC(T) is observed with a power law that is consistent with a disorder-dominated quantum criticality.
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