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(Cl${}_{1-x}$Br${}_x$)${}_2$$\cdot$4SC(NH${}_2$)${}_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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• Nuclear Magnetic Resonance Reveals Disordered Level-Crossing Physics in the Bose-Glass Regime of the Br-doped Ni(Cl${}_{1-x}$Br${}_x$)${}_2$-4SC(NH${}_2$)${}_2$ Compound at a High Magnetic Field
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Cited by in corpus (8)

• Chemical composition induced quantum phase transition in Cs${}_{1-x}$Rb${}_x$FeCl${}_3$
• Spin waves near the edge of halogen substitution induced magnetic order in Ni(Cl${}_{1-x}$Br${}_x$)${}_2$$\cdot$4SC(NH${}_2$)${}_2$
• Pressure-tuned quantum criticality in the large-$D$ antiferromagnet DTN
• Self-consistent T-matrix approach to gap renormalization in quantum magnets with bond disorder
• Magnon spectrum and electron spin resonance in antiferromagnet with large single-ion easy plane anisotropy
• Microwave dynamics of pure and doped anisotropic S=1 chain antiferromagnet NiCl2-4SC(NH2)2
• Finite-temperature dynamics and the role of disorder in nearly critical Ni(Cl${}_{1-x}$Br${}_x$)${}_2$$\cdot$4SC(NH${}_2$)${}_2$
• Easy-plane antiferromagnet in tilted field: gap in magnon spectrum and susceptibility