期刊
PHYSICAL REVIEW B
卷 106, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.L100404
关键词
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资金
- JSPS [JP21H05191, 21H05182]
- JSPS KAKENHI [JP20K03769, JP21K03465]
We present a model compound for a mixed-spin ferromagnetic chain, designed based on organic radicals. The compound shows ferromagnetic behavior and exhibits a double-peak structure in its magnetic specific heat, indicating a phase transition. Quantum Monte Carlo calculations and modified spin-wave theory explain the observed characteristics.
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-Py-V)(2)[Mn(hfac)(2)]. 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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