文章基本信息

标题：Robust antiferromagnetism preventing superconductivity in pressurized (Ba_0.61K_0.39)Mn₂Bi₂
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作者：Dachun Gu ; Xia Dai ; Congcong Le 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep07342
出版社：Springer Nature
摘要：BaMn₂Bi₂ possesses an iso-structure of iron pnictide superconductors and similar antiferromagnetic (AFM) ground state to that of cuprates, therefore, it receives much more attention on its properties and is expected to be the parent compound of a new family of superconductors. When doped with potassium (K), BaMn₂Bi₂ undergoes a transition from an AFM insulator to an AFM metal. Consequently, it is of great interest to suppress the AFM order in the K-doped BaMn₂Bi₂ with the aim of exploring the potential superconductivity. Here, we report that external pressure up to 35.6 GPa cannot suppress the AFM order in the K-doped BaMn₂Bi₂ to develop superconductivity in the temperature range of 300 K–1.5 K, but induces a tetragonal (T) to an orthorhombic (OR) phase transition at ~20 GPa. Theoretical calculations for the T and OR phases, on basis of our high-pressure XRD data, indicate that the AFM order is robust in the pressurized Ba_0.61K_0.39Mn₂Bi₂. Both of our experimental and theoretical results suggest that the robust AFM order essentially prevents the emergence of superconductivity.