Determination of spin Hamiltonian in the Ni 4 magnetic molecule

K. Iida, S. H. Lee, T. Onimaru, K. Matsubayashi, T. J. Sato

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4 Citations (Scopus)


Magnetic excitations in a Ni 4 magnetic molecule were investigated by inelastic neutron scattering and bulk susceptibility (χ bulk) techniques. The magnetic excitation spectrum obtained from the inelastic neutron scattering experiments exhibits three modes at energy transfers of ω=0.5, 1.35, and 1.6 meV. We show that the energy, momentum, and temperature dependencies of the inelastic neutron scattering data and χ bulk can be well reproduced by an effective spin Hamiltonian consisting of intramolecule exchange interactions, a single-ionic anisotropy, biquadratic interactions, and a Zeeman term. Under hydrostatic pressure, the bulk magnetization decreases with increasing pressure, which along with the biquadratic term indicates spin-lattice coupling present in this system.

Original languageEnglish
Article number064422
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number6
Publication statusPublished - 2012 Aug 16


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