We present a model compound that forms a mixed-spin ferromagnetic chain. Our material design, based on the organic radicals, affords a verdazyl-based complex $(p\text{−}\mathrm{Py}\text{−}{\mathrm{V})}_2\left[\mathrm{Mn}{\left(\mathrm{hfac}\right)}_2\right]$. The molecular orbital calculations of the compound indicate the formation of a mixed-spin-(1/2, 1/2, 5/2) ferromagnetic chain. The temperature dependence of magnetic susceptibility reveals its ferromagnetic behavior. The magnetic specific heat exhibits a double-peak structure and indicates a phase transition at the low-temperature peak. The observed characteristics are explained using the quantum Monte Carlo calculations. Furthermore, the modified spin-wave theory verifies that the double-peak structure of the specific heat significantly reflects the relative ration of the acoustic excitation band and the optical excitation gap.

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• 1-dimensional spin chains
• Ferromagnets
• Chemical synthesis
• Quantum Monte Carlo
• Specific heat measurements