Structural feature controlling superconductivity in compressed BaFe 2 As 2

Yang, Wenge; Jia, Feng-Jiang; Tang, Ling-Yun; Tao, Qian; Xu, Zhu-An; Chen, Xiao-Jia

doi:10.1063/1.4867159

Title: Structural feature controlling superconductivity in compressed BaFe ₂ As ₂

Journal Article · Fri Feb 28 00:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4867159· OSTI ID:1385736

Yang, Wenge ^[1]; Jia, Feng-Jiang ^[2]; Tang, Ling-Yun ^[3]; Tao, Qian ^[4]; Xu, Zhu-An ^[4]; Chen, Xiao-Jia ^[5]

Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Washington, Washington, DC (United States)
Chinese Academy of Sciences (CAS), Hefei (China)
Center for High Pressure Science and Technology Advanced Research, Shanghai (China); South China Univ. of Technology (SCUT), Guangzhou (China)
Zhejiang Univ., Hangzhou (China)
Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Chinese Academy of Sciences (CAS), Hefei (China) ; Carnegie Inst. of Washington, Washington, DC (United States)

Superconductivity can be induced with the application of pressure but it disappears eventually upon heavy compression in the iron-based parent compound BaFe₂As₂. Structural evolution with pressure is used to understand this behavior. By performing synchrotron X-ray powder diffraction measurements with diamond anvil cells up to 26.1 GPa, we find an anomalous behavior of the lattice parameter with a $$S$$ shape along the a axis but a monotonic decrease in the $$c$$-axis lattice parameter with increasing pressure. The close relationship between the axial ratio $c/a$ and the superconducting transition temperature $$T_c$$ is established for this parent compound. The $c/a$ ratio is suggested to be a measure of the spin fluctuation strength. The reduction of $$T_c$$ with the further increase of pressure is a result of the pressure-driven weakness of the spin-fluctuation strength in this material.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001057

OSTI ID:: 1385736

Journal Information:: Journal of Applied Physics, Vol. 115, Issue 8; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Title: Structural feature controlling superconductivity in compressed BaFe 2 As 2

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Title: Structural feature controlling superconductivity in compressed BaFe ₂ As ₂