Effect of High Pressure on Resistance in Au(dmit)2LB Films

The high pressure effect on resistance of the LB film of ditetradecyldimethylammonium-Au(dmit)2 [2C14N+Me2-Au(dmit)2] salt has been investigated; the measurements were performed down to 0.8 K and pressures up to 1.03 GPa using a clamptype pressure cell. The resistance gradually decreases with increasing pressure reaching a 57% smaller value at 1.03 GPa compared to the ambient one. The resistance increases with decreasing temperature for three different conditions of the measurement: at 0 GPa and under pressure (clamped at 0.80 GPa and 1.03 GPa) in the temperature range of 18−295 K. Over the whole temperature range, the higher the pressure is, the lower the sheet resistance is, indicating that the application of pressure is effective to reduce the sheet resistance. Although we have already reported the magnetic anomaly suggesting the Meissner state in the LB film below 3.9 K, no resistance drop is observed even if the resistance was measured down to 0.8 K.