Emergence of Superconductivity in 鈥?2522鈥?Structure of (Ca3Al2O5鈥?i>y)(Fe2Pn2) (Pn = As and P)

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• 作者：Parasharam M. Shirage ; Kunihiro Kihou ; Chul-Ho Lee ; Hijiri Kito ; Hiroshi Eisaki ; Akira Iyo
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：June 29, 2011
• 年：2011
• 卷：133
• 期：25
• 页码：9630-9633
• 全文大小：773K
• 年卷期：v.133,no.25(June 29, 2011)
• ISSN：1520-5126

文摘

Using a high-pressure technique, we have successfully synthesized (Ca₃Al₂O_5鈥?i>y)(Fe₂Pn₂) (Pn = As and P), the first iron-based superconductors with the perovskite-based 鈥?2522鈥?structure to be reported. The transition temperature (T_c) is 30.2 K for Pn = As and 16.6 K for Pn = P. The emergence of superconductivity is ascribed to the small tetragonal a-axis lattice constant of the materials. From these results, an empirical relationship is established between the a-axis lattice constant and T_c in iron-based superconductors, which offers a practical guideline for exploring new superconductors with higher T_c.