Magnetic excitations in {Mo72Fe30}

Details Magnetic excitations in {Mo72Fe30} Magnetic excitations in {Mo72Fe30}

2005-05-03

arxiv.org/abs/cond-mat/0505066v1

Physics

Condensed Matter

Other Condensed Matter

submitted to Physical Review Letters (4 pages, 3 figures)

Scientific paper

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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