Kozłowski, P. and Antkowiak, M. and Kamieniarz, G. (2011) Frustration signatures in the anisotropic model of a nine-spin s = 3/2 ring with bond defect. Journal of Nanoparticle Research, 13 (11). pp. 6093-6102.
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Effects of magnetic frustration in the model of nine-membered antiferromagnetic s = 3/2 molecular spin ring are investigated. We use a Heisenberg spin model with nearest-neighbor interactions, single-ion anisotropy and with tunable bond defect leading to continuously varying topology: from closed to open ring. In order to identify a frustrated phase we calculate the full energy spectrum of the model and a number of thermodynamic quantities at low temperature. The calculations are performed by means of numerically exact methods: quantum transfer matrix and exact diagonalization. It is shown that total and local magnetizations, nearest-neighbor spin correlations and spin fluctuations can serve as consistent frustration signatures. Magnetizations and spin-spin correlations are reduced in the frustrated phase whereas fluctuations and correlations of fluctuations increase. The ground state in a frustrated phase is a m = 1/2 doublet and in the non-frustrated phase a m = 3/2 doublet. In the system studied bipartiteness is not opposite to frustration as there are regions in the parameter space for which the system is neither bipartite nor frustrated.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||05 Jan 2012 09:30|
|Last Modified:||05 Jan 2012 09:42|
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