Quantum criticality in a three dimensional spin system at zero field and pressure
Abstract
We report spontaneous appearance of antiferromagnetic order in a model gapped quantum paramagnet Ni(Cl1-xBrx)2·4SC(NH2)2 induced by a change in bromine concentration x. This transition is qualitatively similar to a z = 1 magnetic quantum critical point. However, the observed critical scaling of thermodynamic and magnetic properties has rather unusual critical exponents.
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