Magnetic excitations in {Mo72Fe30}
V. O. Garlea, S. E. Nagler, J. L. Zarestky, C. Stassis, D. Vaknin, P., Kogerler, D. F. McMorrow, C. Niedermayer, D. A. Tennant, B. Lake, Y. Qiu, M., Exler, J. Schnack, and M. Luban
TL;DR
This study uses inelastic neutron scattering to explore magnetic excitations in the large polyoxomolybdate molecule {Mo72Fe30}, revealing a temperature- and field-dependent excitation spectrum explained by a three-sublattice spin model.
Contribution
First detailed neutron scattering analysis of magnetic excitations in {Mo72Fe30} with interpretation via an effective three-sublattice Hamiltonian.
Findings
Identified a magnetic excitation band near 0.6 meV.
Observed spectrum broadening and energy shift with temperature.
Magnetic field significantly influences the excitation spectrum.
Abstract
We report cold-neutron inelastic neutron scattering measurements on deuterated samples of the giant polyoxomolybdate magnetic molecule {Mo72Fe30}. The 30 s = 5/2 Fe+3 ions occupy the vertices of an icosidodecahedron, and interact via antiferromagnetic nearest neighbor coupling. The measurements reveal a band of magnetic excitations near E ~ 0.6 meV. The spectrum broadens and shifts to lower energy as the temperature is increased, and also is strongly affected by magnetic fields. The results can be interpreted within the context of an effective three-sublattice spin Hamiltonian.
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