Abstract
The molecular magnet $\text{Hpyr}[{\text{Fe}}_{17}{\text{O}}_{16}{(\text{OH})}_{12}{(\text{py})}_{12}{\text{Br}}_{4}]{\text{Br}}_{4}$ (``${\text{Fe}}_{17}$'') has a well-defined cluster spin ground state of $S=35/2$ at low temperatures and an axial molecular anisotropy of only $D\ensuremath{\simeq}\ensuremath{-}0.02\text{ }\text{K}$. Dipolar interactions between the molecular spins induce long-range magnetic order below 1.1 K. We report here the magnetic structure of ${\text{Fe}}_{17}$, as determined by unpolarized neutron diffraction experiments performed on a polycrystalline sample of deuterated ${\text{Fe}}_{17}$ in zero applied magnetic field. In addition, we report bulk susceptibility, magnetization, and specific heat data. The temperature dependence of the long-range magnetic order has been tracked and is well accounted for within mean-field theory. Ferromagnetic order along the crystallographic $c$ axis of the molecular spins, as determined by the neutron diffraction experiments, is in agreement with ground-state dipolar energy calculations.
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