Polarised inelastic neutron scattering of a cobalt(II) cubane single-molecule magnet
We propose polarized INS experiments to determine the exchange splitting in the SMM (C(NH2)3)8[Co4(cit)4]. Co4 has a cubane-type structure, with the Co(II) ions bridged by oxo-atoms from the citrate ligands. Bulk magnetic measurements indicated predominant ferromagnetic interactions between the Co(II) spins, and from ac magnetic susceptibility measurements an energy barrier for reversal of the magnetization of ~14.5 cm-1 could be determined. INS measurements with 3.2 Å on FOCUS (SINQ, Switzerland) revealed strong phonon scattering below 6 meV, obfuscating the magnetic excitations expected in this energy range (two small peaks at ~1.5 and ~2.4 meV are possibly magnetic excitations). We propose to do polarized INS experiments on D7, as such experiments would allow differentiating between magnetic and non-magnetic scattering. To the best of our knowledge, these experiments would be the first polarized INS experiments on an SMM, and D7 is the only instrument that makes such an experiment possible, thanks to the high neutron flux and the multidetector setup.
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MURRIE Mark; CHABOUSSANT Gregory; FARRELL Andrew; OCHSENBEIN Stefan and WILDES Andrew. (2012). Polarised inelastic neutron scattering of a cobalt(II) cubane single-molecule magnet. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-04-463
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