Abstract
[Ni(fum)(phen)] (fum = fumarato, phen = 1,10 -phenanthroline) has been identified as a system consisting of antiferromagnetic S = 1 dimers with single-ion magnetic anisotropy D comparable to the intradimer exchange coupling J, D/J ≈ 1 and D/kB = −6 K. We present reclassification of the physical model of [Ni(fum)(phen)] magnetic subsystem and the magnetocaloric investigation of a [Ni(fum)(phen)] powder sample at temperatures above 2 K in magnetic fields up to 7 T. The analysis of magnetic specific heat and magnetocaloric effect in [Ni(fum)(phen)] has shown that the temperature dependence of the isothermal entropy change under different magnetic fields is in good agreement with theoretical predictions for the S = 1 ferromagnetic dimer with D/kB = −11.5 K, E/kB = −3.4 K and intradimer exchange coupling J/kB = 2.5 K. Sizeable conventional magnetocaloric effect was found around 5.8 K leading to -ΔSmax = 8.2 Jkg−1K−1 for ΔB = 7 T.
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