Meissner Effect in an Organic Superconductor (BEDT-TTF)2[Cu(NCS)2]

Abstract
A quite large diamagnetic susceptibility corresponding to 83% of the perfect diamagnetism is observed for (BEDT-TTF)2[Cu(NCS)2] at 2 K. The critical temperature is determined to be 9.8±0.3 K at 30 G. The magnetization shows a hysteresis loop with sharp maxima near 35 G, thereby indicating the type II superconducting nature. The lower critical field and the critical current density are estimated from the analysis of the hysteresis loop.