title: Robust antiferromagnetism preventing superconductivity in pressurized (Ba 0.61 K 0.39)Mn2Bi2.
abstract: 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 Ba0.61K0.39Mn2Bi2. Both of our experimental and theoretical results suggest that the robust AFM order essentially prevents the emergence of superconductivity.
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Dachun
authors.initials: D
authors.lastname: Gu
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Dai
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Congcong
authors.initials: C
authors.lastname: Le
authors.affiliation: 1] Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing. 100190, China.
authors.forename: Liling
authors.initials: L
authors.lastname: Sun
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Wu
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 73831-6056, USA.
authors.forename: Bayrammurad
authors.initials: B
authors.lastname: Saparov
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Guo
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Peiwen
authors.initials: P
authors.lastname: Gao
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yazhou
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Shifeng
authors.initials: S
authors.lastname: Jin
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Lun
authors.initials: L
authors.lastname: Xiong
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Li
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Yanchun
authors.initials: Y
authors.lastname: Li
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 73831-6056, USA.
authors.forename: Athena S
authors.initials: AS
authors.lastname: Sefat
authors.affiliation: 1] Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing. 100190, China.
authors.forename: Jiangping
authors.initials: J
authors.lastname: Hu
authors.affiliation: 1] Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing. 100190, China.
authors.forename: Zhongxian
authors.initials: Z
authors.lastname: Zhao