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The inelastic neutron scattering (INS) spectrum is studied for theantiferromagnetic molecular wheel CsFe8, in the temperature range 2 - 60 K, andfor transfer energies up 3.6 meV. A qualitative analysis shows that theobserved peaks correspond to the transitions between the L-band states, fromthe ground state up to the S = 5 multiplet. For a quantitative analysis, thewheel is described by a microscopic spin Hamiltonian (SH), which includes thenearest-neighbor Heisenberg exchange interactions and uniaxial easy-axissingle-ion anisotropy, characterized by the constants J and D, respectively.For a best-fit determination of J and D, the L band is modeled by an effectiveSH, and the effective SH concept extended such as to facilitate an accuratecalculation of INS scattering intensities, overcoming difficulties with thedimension of the Hilbert space. The low-energy magnetism in CsFe8 isexcellently described by the generic SH used. The two lowest states arecharacterized by a tunneling of the Neel vector, as found previously, while thehigher-lying states are well described as rotational modes of the Neel vector.Comment: 12 pages, 10 figures, REVTEX4, to appear in PR

physical review. b, condensed matter and materials physics

Quantum dynamics of the Néel vector in the antiferromagnetic molecular wheel<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Cs</mml:mi><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>

Quantum dynamics of the Néel vector in the antiferromagnetic molecular wheelCsFe8