MAGNETIC-PROPERTIES OF THE INSULATING STATE OF THE ORGANIC SUPERCONDUCTOR, BETA-[(CH3)(4)N][PD(DMIT)(2)](2)

beta-[(CH3)4N][Pd(dmit)(2)](2), which shows a superconducting transiti on at 6.2 K under a pressure of 6.5 kbar, is semiconducting in resista nce at ambient pressure. Electronic properties was examined by H-1-NMR measurements at ambient pressure and under pressure. We found a magne tic transition at 12 K. The amplitude of the magnetization is estimate d to be 0.22 mu(B) per Pd(dmit)(2)-dimer. Static magnetic susceptibili ty measured by SQUID shows a small temperature dependence. The transit ion temperature was found to decrease slightly under pressure, and sud denly disappeared in the metallic state at 6.5 kbar. We discuss how to understand the electronic state of this system.