Author/Authors :
Funasaka، نويسنده , , Hideyuki and Sakurai، نويسنده , , Koji and Sugiyama، نويسنده , , Kenji and Yamamoto، نويسنده , , Kazunori and Takahashi، نويسنده , , Takeshi، نويسنده ,
Abstract :
The effect of heat treatment of RbxC60 (x = 3, 4, 5, and 6) on the superconducting transition has been studied with shielding diamagnetism measurements. For RbxC60 (x = 4, 5, and 6), a superconducting transition at 12.5 K appeared in the course of annealing treatment at 400°C and disappeared on further prolonged annealing, while a clear superconducting transition at 30 K due to the Rb3C60 phase still remained. We speculate that this superconducting transition at 12.5 K is due to a certain phase which appears in the course of the annealing treatment.
