Quantized antiferromagnetic spin waves in the molecular Heisenberg ring CsFe$_8$

Details Quantized antiferromagnetic spin waves in the molecular Heisenberg ring CsFe$_8$ Quantized antiferromagnetic spin waves in the molecular Heisenberg ring CsFe$_8$

2010-01-21

arxiv.org/abs/1001.3755v1

Phys. Rev. B 81, 024408 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 9 figures, REVTEX 4

Scientific paper

10.1103/PhysRevB.81.024408

We report on inelastic neutron scattering (INS) measurements on the molecular spin ring CsFe$_8$, in which eight spin-5/2 Fe(III) ions are coupled by nearest-neighbor antiferromagnetic Heisenberg interaction. We have recorded INS data on a non-deuterated powder sample up to high energies at the time-of-flight spectrometers FOCUS at PSI and MARI at ISIS, which clearly show the excitation of spin waves in the ring. Due to the small number of spin sites, the spin-wave dispersion relation is not continuous but quantized. Furthermore, the system exhibits a gap between the ground state and the first excited state. We have modeled our data using exact diagonalization of a Heisenberg-exchange Hamiltonian together with a small single-ion anisotropy term. Due to the molecule's symmetry, only two parameters $J$ and $D$ are needed to obtain excellent agreement with the data. The results can be well described within the framework of the rotational-band model as well as antiferromagnetic spin-wave theories.

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