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Oxygen diffusion in C60 films
Authors:M Jaime  M Nuñez Regueiro
Institution:(1) Present address: Centro Atómico Bariloche, 8400 Bariloche, Argentina;(2) Centre de Recherches sur les Très Basses Temperatures, CNRS, B.P.166 Cedex 9, F-38042 Grenoble, France
Abstract:We have performed detailed resistivity measurements as a function of temperature in the range from 12 to 300 K on oxygen loaded C60 films. We observe that two ordering phase transitions (i.e.,T 0=260 K andT g =90 K) are present in rhov(T), which, in addition, strongly depends on the oxygen content. We find a decrease of both ordering temperatures with increasing oxygen concentrations. The mechanisms of oxygen diffusion are greatly enhanced in the ordered phase on heating. Finally, the transition to a glassy state atT g is detected as a point of reversibility of the resistivity curve as a function of temperature.
Keywords:66  30  Jt  73  50  64  70  Kb
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