Fluctuating superconductivity in the strongly correlated two-dimensional organic superconductorκ-(BEDT-TTF)2Cu(NCS)2in an in-plane magnetic field

We report magnetoresistance and magnetic torque measurements for the highly correlated 2D organic superconductor $\ensuremath{\kappa}$-(BEDT-TTF)${}_{2}$Cu(NCS)${}_{2}$. Under magnetic field parallel to the conducting layers, we obtain convincing evidence of fluctuating superconductivity in a wide temperature and field range, where the magnetic torque shows diamagnetism but the resistance shows no appreciable decrease.