Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2 near the antiferromagnetic boundary

Liu, W.; Wu, Y. F.; Li, X. J.; Bud'ko, S. L.; Canfield, P. C.; Panagopoulos, C.; Li, P. G.; Mu, G.; Hu, T.; Almasan, C. C.; Xiao, H.

doi:10.1103/PhysRevB.97.144515

Title: Pressure-tuned superconductivity and normal-state behavior in $Ba ({Fe}_{0.943} {Co}_{0.057})_{2} {As}_{2}$ near the antiferromagnetic boundary

Journal Article · Mon Apr 23 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.144515· OSTI ID:1436424

Liu, W. ^[1]; Wu, Y. F. ^[2]; Li, X. J. ^[3]; Bud'ko, S. L. ^[4]; Canfield, P. C. ^[4]; Panagopoulos, C. ^[5]; Li, P. G. ^[6]; Mu, G. ^[7]; Hu, T. ^[7]; Almasan, C. C. ^[8]; Xiao, H. ^[3]

Center for High Pressure Science and Technology Advanced Research, Beijing (China); Zhejiang SCI-TECH Univ., Hangzhou (China)
Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab. of Functional Materials for Informatics, Shanghai Inst. of Microsystem and Information Technology; Univ. of Chinese Academy of Sciences, Beijing (China).
Center for High Pressure Science and Technology Advanced Research, Beijing (China)
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Nanyang Technological Univ. (Singapore). Division of Physics and Applied Physics, School of Physical and Mathematical Sciences
Zhejiang SCI-TECH Univ., Hangzhou (China)
Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab. of Functional Materials for Informatics, Shanghai Inst. of Microsystem and Information Technology
Kent State Univ., Kent, OH (United States). Dept. of Physics

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 (Fe_{1 - x}Co_x)₂ As₂ 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 P_c = 3.65 GPa. Near P_c, the superconducting transition temperature T c 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. Finally, these results may be associated with a possible quantum critical point hidden inside the superconducting dome, near optimum T_c.

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Research Organization:: Ames Lab., Ames, IA (United States)

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

Grant/Contract Number:: 11574338; AC02-07CH11358; DMR-1505826; U1530402

OSTI ID:: 1436424

Alternate ID(s):: OSTI ID: 1434348

Report Number(s):: IS-J-9648; PRBMDO; TRN: US1900179

Journal Information:: Physical Review B, Vol. 97, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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Pressure tuning of iron-based superconductor Ca ₁₀ (Pt ₃ As ₈ ) ((Fe _0.95 Pt _0.05 ) ₂ As ₂ ) ₅ Yin, X.; Zhang, C.; Mu, G. Journal of Physics: Condensed Matter, Vol. 31, Issue 14 https://doi.org/10.1088/1361-648x/aaffae	journal	February 2019
Pressure effects on iron-based superconductor CaFe _0.88 Co _0.12 AsF Huang, J.; Zhang, C.; Ma, Y. H. Journal of Physics: Condensed Matter, Vol. 31, Issue 32 https://doi.org/10.1088/1361-648x/ab1ef6	journal	May 2019

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Title: Pressure-tuned superconductivity and normal-state behavior in $Ba ({Fe}_{0.943} {Co}_{0.057})_{2} {As}_{2}$ near the antiferromagnetic boundary