Structural feature controlling superconductivity in compressed BaFe 2 As 2
- 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.
- 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
Web of Science
New developments in micro-X-ray diffraction and X-ray absorption spectroscopy for high-pressure research at 16-BM-D at the Advanced Photon Source
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journal | July 2015 |
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