NMR Evidence for Antiferromagnetic Transition in the Single-Component   Molecular System, [Cu(tmdt)$_{2}$]
  The magnetic state of the single-component molecular compound, [Cu(tmdt)$_{2}$], is investigated by means of $^{1}$H-NMR. An abrupt spectral broadening below 13 K and a sharp peak in nuclear spin-lattice relaxation rate, $T_{1}^{-1}$, at 13 K are observed as clear manifestations of a second-order antiferromagnetic transition, which is consistent with the previously reported magnetic susceptibility and EPR measurement. The ordered moment is estimated at $0.22-0.45$ ${\mu}_{\rm B}$/molecule. The temperature-dependence of $T_{1}^{-1}$ above the transition temperature indicates one-dimensional spin dynamics and supports that the spins are on the central part of the molecule differently from other isostructural compounds. 
Rina Takagi, Kazuya Miyagawa, Kazushi Kanoda, Biao Zhou, Akiko   Kobayashi, and Hayao Kobayashi
cond-mat.str-el