2008 年 33 巻 1 号 p. 131-134
Little and/or Ginzburg proposed low dimensional transport systems as an excitonic model to obtain a room temperature superconductivity. We have studied electrical conducting properties observed in self-assembly monolayers of C60-O-C8SH derivatives (C60-SAM) (as a dielectric layer) on Au ultrathin films (as a conductive layer) to realize the Ginzburg's excitonic superconducting model. Electrode Au films were prepared on flat MgO(l00) substrates trough the metal mask by sputtering, and then sputtered Au atoms passed around behind the holes of the mask. Au ultrathin films were successively deposited without the mask by sputtering. The An-deposited specimens were soaked in a 0.01 mM benzene solution of C60 derivatives for 20 h at room temperature to form C60-SAM. Several specimens revealed the deviation from linear temperature dependence of resistance accompanying with steep decrease of resistivity in the temperature region less than 100 K - 130 K. Such the resistivity anomaly was observed only in the specimens which had ultrathin Au film area with the dimension of less than about 10 m.
