One-dimensional organic superconductivity : an investigation through electron Schottky tunnelling in N/GaSb-(TMTSF)2PF6 junctions under pressure

Observation of a large pseudo-gap at the Fermi level by Schottky tunnelling of electrons from N doped-GaSb into the organic superconductor (TMTSF) 2PF6 under a pressure of 11 kbar (Tc = 1 K) establishes, on an unambiguous experimental basis the one-dimensional character of the low temperature superconducting divergence and so justifies the presence of 1-D superconducting fluctuations to high temperatures. The intrachain pairing energy 2 Δ(0) = 3.6 meV derived from tunnelling characteristics emphasizes the strength of the superconducting channel in the family of organic superconductors (TMTSF)2X.