Interlayer magnetoresistance peak in beta ''-(BEDT-TTF)(2)SF5CH2CF2SO3

Transport measurements of interlayer magnetoresistance with the field paral lel to the current direction have been performed on single crystals of orga nic superconductor beta''-(BEDT-TF)(2)SF5CH2CF2SO3. The magnetoresistance i s found to display a pronounced peak as a function of magnetic field below the superconducting transition temperature, similar to those of kappa-(BEDT -TTF)(2)X compounds. Analysis of the magnetoresistance peak in terms of a s imple pair and quasiparticle tunneling model gives a physically negligible gap energy. (C) 1999 American Institute of Physics. [S0021-8979(99)17008-7] .