Graphene Becomes Superconductive (image) Tohoku University Share Print E-Mail Caption This is the crystal structure of Ca-intercalated bilayer graphene fabricated on SiC substrate. Insertion of Ca atoms between two graphene layers causes the superconductivity. Credit Takashi Takahashi Usage Restrictions Credit: Takashi Takahashi Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.