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Kono","submitted_at":"2018-12-19T08:08:11Z","abstract_excerpt":"We successfully synthesized a verdazyl-based charge-transfer salt $[$$o$-MePy-V-($p$-Br)$_2]$FeCl$_4$, which has an $S_{\\rm{V}}$=1/2 on the radical $o$-MePy-V-($p$-Br)$_2$ and an $S_{\\rm{Fe}}$=5/2 on the FeCl$_4$ anion. $Ab$ $initio$ molecular orbital calculations indicate the formation of an $S_{\\rm{V}}$=1/2 honeycomb lattice composed of three types of exchange interaction with two types of inequivalent site. Further, the $S_{\\rm{V}}$=1/2 at one site is sandwiched by $S_{\\rm{Fe}}$=5/2 spins through antiferromagnetic (AF) interactions. 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