Pressure-induced phase coexistence in BaFe1.8Co0.2As2

Tang, Ling-Yun; Tao, Qian; Xu, Zhu-An; Chen, Xiao-Jia

doi:10.1063/1.4870860

Title: Pressure-induced phase coexistence in BaFe_1.8Co_0.2As₂

Journal Article · Fri Apr 11 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4870860· OSTI ID:1385724

Tang, Ling-Yun ^[1]; Tao, Qian ^[2]; Xu, Zhu-An ^[2]; Chen, Xiao-Jia ^[3]

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

We report high-pressure powder synchrotron X-ray diffraction measurements of overdoped BaFe_1.8Co_0.2As₂ under quasi-hydrostatic pressure up to 40.1 GPa. Our results indicate that a tetragonal (T) to collapsed tetragonal (CT) phase transition occurs at 16.8 GPa and the two phase coexist until 30 GPa, which has not been previously observed in iron arsenide compounds. Both the lattice parameters a and c show discontinuous change for the T and CT phases. The decrease of the c lattice parameter is as large as 12.2% owing to the uniaxial pressure effect. The axial ratio c/a of the T phase exhibits similar features to the other 122-type compounds below 16.8 GPa, whereas there is a very small increase with increasing pressure in the two phase coexistence region. Because of the relationship between the axial ratio and superconductivity, the abnormal expansion may be related to the sudden increase of the strength of antiferromagnetic spin fluctuations.

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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:: 1385724

Journal Information:: Journal of Applied Physics, Vol. 115, Issue 14; 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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