Journal article

Exchange constants and spin dynamics in Mn₁₂-acetate

  • Honecker, A. Institut für Theoretische Physik, Technische Universität Braunschweig, Germany
  • Fukushima, N. Institut für Theoretische Physik, Technische Universität Braunschweig, Germany - University of the Saarland, Theoretische Physik, Saarbrücken, Germany
  • Normand, Bruce Department of Physics, Fribourg University, Switzerland
  • Chaboussant, G. Laboratoire Léon Brillouin, CEA-SaclayGif-sur-Yvette, France
  • Güdel, Hans-Ulrich Departement für Chemie und Biochemie, Universität Bern, Switzerland
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  • Journal of Magnetism and Magnetic Materials. - 2005, vol. 290-291, p. 966-969
English We have obtained new inelastic neutron scattering (INS) data for the molecular magnet Mn₁₂-acetate which exhibit at least six magnetic peaks in the energy range 5–35 meV. These are compared with a microscopic Heisenberg model for the 12 quantum spins localised on the Mn ions, coupled by four inequivalent magnetic exchange constants. A fit to the magnetic susceptibility under the constraint that the spin of the ground state be S=10 yields two dominant exchange constants of very similar value, J1≈J2≈65 K (≈5.5 meV), and two smaller exchange constants J3 and J4. We compute the low-lying excitations by exact numerical diagonalisation and demonstrate that the parameters determined from the ground state and susceptibility fit provide qualitative agreement with the excitations observed by INS.
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