Correlation between the critical current and the structural transformation near 80 K in the organic superconductor κ-(BEDT-TTF)_2CuN(CN)_2Br

摘要

We have systematically studied the critical current and the magnetic susceptibility as a function of the cooling rate through the order-disorder transformation near 80 K for the κ-(BEDT-TTF)_2Br organic superconductor. Our results show that the magnetic properties of these compounds depend strongly on the cooling rate V_c, and this disorder can influence very strongly the physics of the vortex lattice. The degree of ordering depends on the cooling rate through 80 K.