Direct evidence of intercalation in a topological insulator turned superconductor

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• 作者：Tanmay Das ; Somnath Bhattacharyya ; ^{somnath@tifr.res.in} ; Bhanu Prakash Joshi ; Arumugum Thamizhavel ; Srinivasan Ramakrishnan
• 关键词：Topological insulator ; Superconductivity ; Intercalation ; Transmission electron microscopy ; Exit face wave reconstruction ; Crystal structure
• 刊名：Materials Letters
• 出版年：2013
• 出版时间：15 February, 2013
• 年：2013
• 卷：93
• 期：Complete
• 页码：370-373
• 全文大小：643 K

文摘

A topological insulator Bi₂Se₃ which shows superconductivity due to Cu doping has been studied using high resolution transmission electron microscopy. For the first time, this study reveals the presence of intercalated structure at nanoscale within the bulk material which is supposed to be the prime reason for superconductivity in doped topological insulator. A careful study exhibits the presence of two intercalation sites in this material when projected along the [?1?1 0] direction. Stoichiometry of the intercalated unit cell was also calculated from the projected mean inner potential.