Abstract

We report on pressure-dependent superconducting and transport properties of the quasi-two-dimensional organic superconductor β″-(ET)2SF5CH2CF2SO3. With increasing pressure both the superconducting transition temperature, Tc, as well as the effective mass, mc, decrease monotonously. By assuming a direct relationship between mc and the superconducting coupling parameter λ, the pressure dependence of Tc can be well described by the modified McMillan equation. For all pressures in the metallic state the resistance follows ρ=ρ0+AT2 at low temperatures. The coefficient A, however, is found to be not proportional to mc2 as expected for a purely electronic origin of the T2 behavior.

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