title: Ba2Ti2Fe2As4O: A new superconductor containing Fe2As2 layers and Ti2O sheets.
abstract: 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.
authors: Department of Physics, ‡State Key Lab of Silicon Materials, and §Center of Electron Microscope, Zhejiang University , Hangzhou 310027, China.
authors: Yun-Lei
authors: YL
authors: Sun
authors: Hao
authors: H
authors: Jiang
authors: Hui-Fei
authors: HF
authors: Zhai
authors: Jin-Ke
authors: JK
authors: Bao
authors: Wen-He
authors: WH
authors: Jiao
authors: Qian
authors: Q
authors: Tao
authors: Chen-Yi
authors: CY
authors: Shen
authors: Yue-Wu
authors: YW
authors: Zeng
authors: Zhu-An
authors: ZA
authors: Xu
authors: Guang-Han
authors: GH
authors: Cao