Synthesis, Structural, and Transport Properties of Cr-Doped BaTi2As2O

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• 作者：Qiucheng Ji ; Yonghui Ma ; Kangkang Hu ; Bo Gao ; Gang Mu ; Wei Li ; Tao Hu ; Ganghua Zhang ; Qingbiao Zhao ; Hui Zhang ; Fuqiang Huang ; Xiaoming Xie
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：December 15, 2014
• 年：2014
• 卷：53
• 期：24
• 页码：13089-13092
• 全文大小：275K
• ISSN：1520-510X

文摘

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鈥?i>xCr_xAs₂O (x = 0鈥?.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.