Effective realization of random magnetic fields in compounds with large single-ion anisotropy

Abstract

We show that spin $S=1$ system with large and random single--ion anisotropy can be at low energies mapped to a $S=1/2$ system with random magnetic fields. This is for example realized in \mbox{Ni(Cl${}_{1-x}$Br${}_x$)${}_2$-4SC(NH${}_2$)${}_2$} compound (DTNX) and therefore it represents a long sought realization of random local (on-site) magnetic fields in antiferromagnetic systems. We support the mapping by numerical study of $S=1$ and effective $S=1/2$ anisotropic Heisenberg chains and find excellent agreement for static quantities and also for the spin conductivity. Such systems can therefore be used to study the effects of local random magnetic fields on transport properties.

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Cited by in corpus (5)

• Density correlations and transport in models of many-body localization
• Complete many-body localization in the t-J model caused by random magnetic field
• Resistivity and its fluctuations in disordered many-body systems: from chains to planes
• Semiclassical bounds on dynamics of two-dimensional interacting disordered fermions
• Scattering theory of transport through disordered magnets