Evaluation of Exchange Interactions of the Spin Doughnut Mo_{75}V_{20}

Details Evaluation of Exchange Interactions of the Spin Doughnut Mo_{75}V_{20} Evaluation of Exchange Interactions of the Spin Doughnut Mo_{75}V_{20}

2007-04-30

arxiv.org/abs/0704.3869v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

10.1143/JPSJ.76.083709

Magnetic properties of the spin doughnut Mo_{75}V_{20}, which is a frustrated magnetic cluster with twenty spins, are studied by using the finite-temperature Lanczos method. Our model Hamiltonian consists of one ten-spin ring and two five-spin rings with nearest-neighbor antiferromagnetic couplings J and J". The five-spin rings are coupled to the ten-spin ring by an antiferromagnetic exchange interaction J' so as to form isosceles triangles of one J-bond and two J'-bonds. Fitting the theoretical magnetic susceptibility with the experimental one measured by Muller et al., the exchange parameters are estimated as J=388 K, J'=163 K and J"=81 K. The most interesting feature of this system is that the two five-spin rings behave like two free-spins at low temperatures in despite of J'>J". We also calculate temperature dependence of the specific heat, and find three peaks at T sim J, J" and J'/100.

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