From single-molecule magnetism to long-range ferromagnetism in Hpyr[Fe 17O16(OH)12(py)12Br4]Br4

Carlo Vecchini, Dominic R. Ryan, Lachlam M.D. Cranswick, Marco Evangelisti, Winfried Kockelmann, Paulo G. Radaelli, Andrea Candini, Marco Affronte, Ian A. Gass, Euan K. Brechin, Oscar Moze

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The molecular magnet Hpyr[Fe 17O16OH12py12Br4Br4] “Fe17” has a well-defined cluster spin ground state of S=35/2 at low temperatures and an axial molecular anisotropy of only D ≈−0.02 K. Dipolar interactions between the molecular spins induce long-range magnetic order below 1.1 K. We report here the magnetic structure of Fe17, as determined by unpolarized neutron diffraction experiments performed on a polycrystalline sample of deuterated Fe17 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.
Original languageEnglish
JournalPhysical Review B
Publication statusPublished - 2 Jun 2008


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