A newly synthesized donor meso-DMBEDT-TTF [DMBEDT-TTF = 2-(5,6-dihydro-1,3-dithiolo[4,5-b][1,4]dithiin-2-ylidene)-5,6-dihydro-5,6-dimethyl-1,3-dithiolo[4,5-b][1,4]dithiin] afforded a superconducting salt beta-(meso-DMBEDT-TTF)2PF6, with a transition temperature at 4.3 K (onset) under a hydrostatic pressure of 4.0 kbar.
The pressure dependence of resistivity for the checkerboard-type charge-ordered ͑CO͒ molecular conductor -͑meso-DMBEDT-TTF͒ 2 PF 6 has been investigated. Under the low pressure of 0.6 kbar, the temperature of resistivity minimum ͑T min ͒ falls from 90 K at an ambient pressure to 67 K, and after the resistivity has been increased, the superconducting ͑SC͒ transition is observed at 4.6 K. By applying magnetic field, the SC state is suppressed and the large positive magnetoresistance ͑MR͒ is demonstrated below T min in the CO state. Since the positive MR was observed even in the metallic state under high pressures, the summarized pressuretemperature ͑P − T͒ phase diagram reveals that the SC state neighbors to the CO-insulating and chargefluctuated metallic states.
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