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.
@article{arxiv.cond-mat/0505066,
title = {Magnetic excitations in {Mo72Fe30}},
author = {V. O. Garlea and S. E. Nagler and J. L. Zarestky and C. Stassis and D. Vaknin and P. Kogerler and D. F. McMorrow and C. Niedermayer and D. A. Tennant and B. Lake and Y. Qiu and M. Exler and J. Schnack and M. Luban},
journal= {arXiv preprint arXiv:cond-mat/0505066},
year = {2013}
}
Comments
submitted to Physical Review Letters (4 pages, 3 figures)