Q-dependence of the inelastic neutron scattering cross section for molecular spin clusters with high molecular symmetry

Details Q-dependence of the inelastic neutron scattering cross section for molecular spin clusters with high molecular symmetry Q-dependence of the inelastic neutron scattering cross section for molecular spin clusters with high molecular symmetry

2003-04-21

arxiv.org/abs/cond-mat/0304463v1

Phys. Rev. B 68, 174406 (2003)

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 1 figures, REVTEX4

Scientific paper

10.1103/PhysRevB.68.174406

For powder samples of polynuclear metal complexes the dependence of the inelastic neutron scattering intensity on the momentum transfer Q is known to be described by a combination of so called interference terms. They reflect the interplay between the geometrical structure of the compound and the spatial properties of the wave functions involved in the transition. In this work, it is shown that the Q-dependence is strongly interrelated with the molecular symmetry of molecular nanomagnets, and, if the molecular symmetry is high enough, is actually completely determined by it. A general formalism connecting spatial symmetry and interference terms is developed. The arguments are detailed for cyclic spin clusters, as experimentally realized by e.g. the octanuclear molecular wheel Cr8, and the star like tetranuclear cluster Fe4.

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