Title of article :
Langmuir-Blodgett superconductors based on C60, new donor-acceptor systems, and a new conducting polymer
Author/Authors :
Metzger، نويسنده , , Robert M. and Wang، نويسنده , , Ping and Wu، نويسنده , , Xiang-Li and Tormos، نويسنده , , Gregory V. and Lorcy، نويسنده , , Dominique and Shcherbakova، نويسنده , , Irina and Lakshmikantham، نويسنده , , M.V. and Cava، نويسنده , , Michael P.، نويسنده ,
Abstract :
Pure C60 forms Langmuir-Blodgett (LB) multilayers; a hysteretic low-field signal in an EPR spectrometer in a K-doped 50-layer LB multilayer of C60 appears at or below 8.1 K, due to flux exclusion (Meissner-Ochsenfeld effect) by K3C60, i.e. due to superconductivity: this is the first LB film superconductor. The crystal structure of BDMT-TTeF (1) with C60 and a molecule of CS2, an electrical insulator, has been determined. Other donors, such as DTDAF (2), form a 1:1 insulating and a 2:5 semiconducting (0.01 S/cm) complex with TCNQ, with evidence for TCNQ-- dianions in the solid state. A conducting polymer, poly-(naptho-[2,3-c]thiophene-alt-bithiophene) (3) has a band gap of only 0.65 eV, and a conductivity of 0.002 S/cm.
