Heisenberg exchange parameters of molecular magnets from the high-temperature susceptibility expansion

Details Heisenberg exchange parameters of molecular magnets from the high-temperature susceptibility expansion Heisenberg exchange parameters of molecular magnets from the high-temperature susceptibility expansion

2001-07-05

arxiv.org/abs/cond-mat/0107111v1

Phys. Rev. B 64 (2001) 224415

Physics

Condensed Matter

Statistical Mechanics

13 pages, 7 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.224415

We provide exact analytical expressions for the magnetic susceptibility function in the high temperature expansion for finite Heisenberg spin systems with an arbitrary coupling matrix, arbitrary single-spin quantum number, and arbitrary number of spins. The results can be used to determine unknown exchange parameters from zero-field magnetic susceptibility measurements without diagonalizing the system Hamiltonian. We demonstrate the possibility of reconstructing the exchange parameters from simulated data for two specific model systems. We examine the accuracy and stability of the proposed method.

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