Pressure dependence of the electronic properties of the quasi-two-dimensional organic superconductor beta"-(ET)₂SF₅CH₂CF₂SO₃

We report on pressure-dependent superconducting and transport properties of the quasi-two-dimensional organic superconductor b"-(ET)₂SF₅CH₂CF₂SO₃. With increasing pressure both the superconducting transition temperature, T_c, as well as the effective mass, m_c, decrease monotonously. By assuming a direct relationship between m_c and the superconducting coupling parameter λ, the pressure dependence of T_c can be well described by the modified McMillan equation. For all pressures in the metallic state the resistance follows q = q0 + AT² at low temperatures. The coefficient A, however, is found to be not proportional to m² _c as expected for a purely electronic origin of the T² behavior.