Frustration on a centred pyrochlore lattice in metal-organic frameworks

Abstract

Geometric frustration inhibits magnetic systems from ordering, opening a window to unconventional phases of matter. The paradigmatic frustrated lattice in three dimensions to host a spin liquid is the pyrochlore, although there remain few experimental compounds thought to realize such a state. Here we go beyond the pyrochlore via molecular design in the metal-azolate framework [Mn(II)(ta)${}_2$], which realizes a closely related centred pyrochlore lattice of Mn-spins with $S=5/2$. Despite a Curie-Weiss temperature of $-21$ K indicating the energy scale of magnetic interactions, [Mn(II)(ta)${}_2$] orders at only 430 mK, putting it firmly in the category of highly frustrated magnets. Comparing magnetization and specific heat measurements to numerical results for a minimal Heisenberg model, we predict that this material displays distinct features of a classical spin liquid with a structure factor reflecting Coulomb physics in the presence of charges.

Main: 6 pages, 3 figures. Supplementary: 15 pages, 12 figures. Updated Version

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Cited by in corpus (2)

• The Classical Heisenberg Model on the Centred Pyrochlore Lattice
• Coupling quantum spin ice to matter on the centered pyrochlore lattice