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A quantum critical point arises at a continuous transformation betweendistinct phases of matter at zero temperature. Studies in antiferromagneticheavy fermion materials have revealed that quantum criticality has severalclasses, with an unconventional type that involves a critical destruction ofthe Kondo entanglement. In order to understand such varieties, it is importantto extend the materials basis beyond the usual setting of intermetalliccompounds. Here we show that a nickel oxypnictide, CeNiAsO, displays aheavy-fermion antiferromagnetic quantum critical point as a function of eitherpressure or P/As substitution. At the quantum critical point, non-Fermi liquidbehavior appears, which is accompanied by a divergent effective carrier mass.Across the quantum critical point, the low-temperature Hall coefficientundergoes a rapid sign change, suggesting a sudden jump of the Fermi surfaceand a destruction of the Kondo effect. Our results imply that the enormousmaterials basis for the oxypnictides, which has been so crucial to the searchfor high temperature superconductivity, will also play a vital role in theeffort to establish the universality classes of quantum criticality in stronglycorrelated electron systems.

Heavy Fermion Quantum Criticality and Destruction of the Kondo Effect in a Nickel Oxypnictide