Abstract

Molecular designing analyses and electrical properties of [(CH 3) 4N][Ni(dmit) 2] 2 and α- and β-[(CH 3) 4N][Pd(dmit) 2] 2 are presented. In [(CH 3) 4N][Ni(dmit) 2] 2, the resistivity jump at around 100 K and the sharp rise of resistivity below 20 K were observed. In the sample where the low temperature anomaly was suppressed by high pressure, we have observed a superconducting transition: 3.0 K at 3.2 kbar and 5.0 K at 7 kbar. The 100 K anomaly is accompanied by large hysteresis. Non-linear conducting behavior was observed in this temperature region.

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