Abstract
The κ-(BEDT-TTF) 2Cu[N(CN) 2]Br is a quasi-two-dimensional superconductor with the highest T c of ∼12 K among organic conductors. However, the antiferromagnetic insulating state appears by deuteration of BEDT-TTF ( κ- d8-Br) or substitution of Cl ( κ-Cl) for Br. The 13 C NMR measurements of these two insulating compounds, which are situated near the superconducting phase, were carried out to probe magnetic structure. The NMR spectra of κ-Cl and κ- d8-Br clearly indicate the commensurate antiferromagnetic structure with ordered moments of 0.45 μ B/(BEDT-TTF) 2 and 0.3 μ B/(BEDT-TTF) 2, respectively, which provides unambiguous evidence that κ-Cl and κ- d8-Br are Mott insulators.
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