title: Synthesis, structural, and transport properties of Cr-doped BaTi2As2O.
abstract: The interplay between unconventional superconductivity and the ordering of charge/spin density wave is one of the most vital issues in both condensed matter physics and material science. The Ti-based compound BaTi2As2O, which can be seen as the parent phase of superconducting BaTi2Sb2O, has a layered structure with a space group P4/mmm, similar to that of cuprate and iron-based superconductors. This material exhibits a charge density wave (CDW) ordering transition revealed by an anomaly at around 200 K in transport measurements. Here, we report the synthesis and systematical study of the physical properties in Cr-doped BaTi(2-x)Cr(x)As2O (x = 0-0.154) and demonstrate that the transition temperature of the CDW ordering is suppressed gradually by the doped Cr element. The magnetization measurements confirm the evolution of the CDW ordering transition. These observed behaviors are similar to that observed in iron-based superconductors, but no superconductivity emerges down to 2 K. In addition, the first-principles calculations are also carried out for well-understanding the nature of experimental observations.
authors.affiliation: State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences , Shanghai 200050, China.
authors.forename: Qiucheng
authors.initials: Q
authors.lastname: Ji
authors.forename: Yonghui
authors.initials: Y
authors.lastname: Ma
authors.forename: Kangkang
authors.initials: K
authors.lastname: Hu
authors.forename: Bo
authors.initials: B
authors.lastname: Gao
authors.forename: Gang
authors.initials: G
authors.lastname: Mu
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Hu
authors.forename: Ganghua
authors.initials: G
authors.lastname: Zhang
authors.forename: Qingbiao
authors.initials: Q
authors.lastname: Zhao
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Fuqiang
authors.initials: F
authors.lastname: Huang
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Xie