Investigation of a V_(15) magnetic molecular nanocluster by the Monte Carlo method

摘要

Exchange interactions in a V_(15) magnetic molecular nanocluster are considered, and the process of magnetization reversal for various values of the set of exchange constants is analyzed by the Monte Carlo method. It is shown that the best agreement between the field dependence of susceptibility and experimental results is observed for the following set of exchange interaction constants in a V_(15) magnetic molecular nanocluster: J = 500 K, J′ = 150 K, J″ = 225 K, J _1 = 50 K, and J _2 = 50 K. It is observed for the first time that, in a strong magnetic field, for each of the three transitions from low-spin to high-spin states, the heat capacity exhibits two closely spaced maxima.