Dielectric loss in a C[sub 60] film observed by coupling with the external electromagnetic field of a surface acoustic wave

Sun, Yong; Yamasaki, Yuichi; Kirimoto, Kenta; Miyasato, Tatsuro; Wigmore, J. Keith; Moriyama, Fuminori; Takase, Tsuyoshi
January 2003
Applied Physics Letters;1/6/2003, Vol. 82 Issue 1, p34
Academic Journal
The dielectric loss in C[sub 60] films was studied by a noncontacting technique utilizing the external electric fields associated with surface acoustic waves (SAW) on a piezoelectric crystal. A sharp increase in loss was observed at temperatures below 220 K together with other structure not found with standard SAW measurements. We believe that these features are due to induced current in C[sub 60], causing joule loss, and to the formation of localized dipole moments by charge transfer between adsorbed O[sub 2] and C[sub 60] molecules, giving rise to thermally activated relaxation.


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