Superconducting Transition of (TMTSF)2CLO4 in Magnetic Fields

Superconducting transition of (TMTSF)2ClO4 was studied by conductivity measurements along the most conductive a-axis in magnetic fields applied along three different principal crystallographic axes. The GL coherence lengths at OK along the a-, b-, and c*-axes, ϵa(0)≈ 600A, ϵ(0) ≈ 540A, and ϵc*(0) ≈ 60A were obtained from the measurements of the temperature dependence of the upper critical field HC2 near the transition temperature. The anisotropy is discussed in terms of the dimensionality arising from the crystal structure and of the conductivity anisotropy in the normal state.