Heisenberg model of an {Fe8}-cubane cluster

Larry Engelhardt, Ian A. Gass, Constantino J. Milios, Euan K. Brechin, Mark Murrie, Ruslan Prozorov, Matthew Vannette, Marshall Luban

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

An analysis of the measured magnetic susceptibility of the recently synthesized magnetic molecule {Fe-8}-cubane ([(Fe8O4)-O-III(sao)(8)(py)(4)]) leads to a detailed proposal based on an isotropic Heisenberg model for the interactions between the eight Fe-III ions. In the theoretical model, the magnetic ions are situated on the vertices of a cube with one exchange constant linking nearest neighbors and a second exchange constant (appearing as a single diagonal across each of the six faces of the cube) linking four of the eight ions on alternate sites. Excellent agreement between the experimental and theoretical susceptibility data is achieved, thereby providing estimates for the numerical values of the two exchange constants. Independent tests of the theoretical model are proposed in terms of inelastic neutron scattering and high-field magnetic susceptibility measurements at low temperatures that would probe the predicted low-lying magnetic energy levels of the system.

Original languageEnglish
Article number172406
Pages (from-to)-
Number of pages4
JournalPhysical review B
Issue number17
Publication statusPublished - Nov 2007

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