Ba2Ti2Fe2As4O: A New Superconductor Containing Fe2As2 Layers and Ti2O Sheets

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• 作者：Yun-Lei Sun ; Hao Jiang ; Hui-Fei Zhai ; Jin-Ke Bao ; Wen-He Jiao ; Qian Tao ; Chen-Yi Shen ; Yue-Wu Zeng ; Zhu-An Xu ; Guang-Han Cao
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：August 8, 2012
• 年：2012
• 卷：134
• 期：31
• 页码：12893-12896
• 全文大小：338K
• 年卷期：v.134,no.31(August 8, 2012)
• ISSN：1520-5126

文摘

We have synthesized a new oxypnictide, Ba₂Ti₂Fe₂As₄O, via a solid-state reaction under a vacuum. The compound crystallizes in a body-centered tetragonal lattice, which can be viewed as an intergrowth of BaFe₂As₂ and BaTi₂As₂O, thus containing Fe₂As₂ layers and Ti₂O sheets. Bulk superconductivity at 21 K is observed after annealing the as-prepared sample at 773 K for 40 h. In addition, an anomaly in resistivity and magnetic susceptibility around 125 K is revealed, suggesting a charge- or spin-density wave transition in the Ti sublattice.