Ba2Ti2Fe2As4O: A new superconductor containing Fe2As2 layers and Ti2O sheets.

@article{Sun2012Ba2Ti2Fe2As4OAN,
  title={Ba2Ti2Fe2As4O: A new superconductor containing Fe2As2 layers and Ti2O sheets.},
  author={Yun-Lei Sun and Hao Jiang and Hui-fei Zhai and Jin-Ke Bao and W H Jiao and Qian Tao and Chen-Yi Shen and Yue-Wu Zeng and Zhu-an Xu and Guang-Han Cao},
  journal={Journal of the American Chemical Society},
  year={2012},
  volume={134 31},
  pages={12893-6}
}
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… CONTINUE READING
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