Quantum criticality in a three dimensional spin system at zero field and pressure

K. Yu. Povarov, A. Mannig, G. Perren +4

We report spontaneous appearance of antiferromagnetic order in a model gapped quantum paramagnet Ni(Cl${}_{1-x}$Br${}_x$)${}_2$$\cdot$4SC(NH${}_2$)${}_2$ induced by a change in bromine conce…