Abstract
We present low-temperature specific heat and magnetization measurements of the $S$ = 1/2 organic spin ladder 3-I-V [3-(3-iodophenyl)-1,5-diphenylverdazyl]. $Ab\phantom{\rule{4.pt}{0ex}}initio$ molecular orbital calculations indicate the existence of an intraladder diagonal interaction ${J}_{\mathrm{diag}}$ and three types of interladder interactions. The ferromagnetic ${J}_{\mathrm{diag}}$ induces frustration in the spin ladder, which has an essential contribution to the ground state. The obtained phase diagram exhibits a low-field three-dimensional order and a nontrivial phase near the saturation field. The absence of successive phase transition with decreasing temperature and the anomalous behavior of the magnetization curve near the saturation field suggest that these two phases are longitudinal spin-density-wave and spin-multipolar orders, respectively.
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