Dramatic Anisotropy of Organic Superconducting Thin Film Formation on (TMTSF)2PF6 Single-Crystal Templates

The generation of (TMTSF) 2 ClO 4 overlayers on (TMTSF) 2 PF 6 single crystals, obtained by immersing templates in 1,1,2-trichloroethane at room temperature, is shown to be highly anisotropic. Well-defined 5−15 μm thick films are formed exclusively on the (011̄) faces of the crystal. These films are found to be superconducting by conductivity measurements. The electrochemical formation of (TMTSF) 2 ClO 4 overlayers, under the same solution conditions, only takes place by epitaxial overgrowth onto the (001) faces.