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The ground state of $\lambda$-(BEDT-TTF)$_2$GaCl$_4$, which has the samestructure as the organic superconductor $\lambda$-(BETS)$_2$GaCl$_4$, wasinvestigated by magnetic susceptibility and $^{13}$C NMR measurements. Thetemperature dependence of the magnetic susceptibility revealed anantiferromagnetic (AF) correlation with $J/k_{\rm B} \simeq$ 98 K. NMR spectrumsplitting and the divergence of $1/T_1$ were observed at approximately 13 K,which is associated with the AF transition. We found that the AF structure iscommensurate according to discrete NMR peak splitting, suggesting that theground state of $\lambda$-(BEDT-TTF)$_2$GaCl$_4$ is an AF dimer-Mott insulatingstate. Our results suggest that the superconducting phase of $\lambda$-typesalts would be located near the AF insulating phase.

Antiferromagnetic ordering in organic conductor $\lambda$-(BEDT-TTF)$_2$GaCl$_4$ probed by $^{13}$C NMR