Geometric Frustration on the Trillium Lattice in a Magnetic Metal-Organic Framework

???trillium??? net. We show that the system is strongly magnetically frustrated: the Ne??el transition is suppressed well below the characteristic magnetic interaction strength; short-range magnetic order persists far above the Ne??el temperature; and the magnetic susceptibility exhibits a pseudo-plateau at 13-saturation magnetization. A simple model of nearest-neighbor Heisenberg antiferromagnetic and dipolar interactions accounts quantitatively for all observations, including an unusual 2-k magnetic ground state. We show that the relative strength of dipolar interactions is crucial to selecting this particular ground state. Geometric frustration within the classical spin liquid regime gives rise to a large magnetocaloric response at low applied fields that is degraded in powder samples as a consequence of the anisotropy of dipolar interactions.

Automated summary

This article investigates a trillium network system with strong magnetic frustration. The study shows that the Néel transition is suppressed, short-range magnetic order persists, and the magnetic susceptibility exhibits a pseudo-plateau at saturation magnetization. By establishing a simple model, the researchers quantitatively explain all observations and find that the relative strength of dipolar interactions plays a crucial role in selecting the particular magnetic ground state.