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Title: Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2 near the antiferromagnetic boundary
Authors: Liu, W.
Wu, Y. F.
Li, X. J.
Bud'ko, S. L.
Canfield, P. C.
Li, P. G.
Mu, G.
Hu, T.
Almasan, C. C.
Xiao, H.
Panagopoulos, Christos
Keywords: Superconductivity
Antiferromagnetic Boundary
Issue Date: 2018
Source: Liu, W., Wu, Y. F., Li, X. J., Bud'ko, S. L., Canfield, P. C., Panagopoulos, C., . . . & Xiao, H. (2018). Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2 near the antiferromagnetic boundary. Physical Review B, 97(14), 144515-. doi: 10.1103/PhysRevB.97.144515
Series/Report no.: Physical Review B
Abstract: Superconductivity in iron pnictides is unconventional and pairing may be mediated by magnetic fluctuations in the Fe sublattice. Pressure is a clean method to explore superconductivity in iron based superconductors by tuning the ground state continuously without introducing disorder. Here we present a systematic high pressure transport study in Ba(Fe1-xCox)2As2 single crystals with x=0.057, which is near the antiferromagnetic instability. Resistivity ρ=ρ0+ATn was studied under applied pressure up to 7.90 GPa. The parameter n approaches a minimum value of n ≈ 1 at a critical pressure Pc = 3.65 GPa. Near Pc, the superconducting transition temperature Tc reaches a maximum value of 25.8 K. In addition, the superconducting diamagnetism at 2 K shows a sudden change around the same critical pressure. These results may be associated with a possible quantum critical point hidden inside the superconducting dome, near optimum Tc.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.97.144515
Rights: © 2018 American Physical Society. This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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