Superconductivity with Tc ≈ 7 K under pressure for Cu- and Au-doped BaFe2As2

Li, Li; Parker, David S.; Cao, Huibo B.; Gai, Zheng; Sefat, Athena S.

doi:10.1088/1361-648x/ab7e60

Superconductivity with T_c ≈ 7 K under pressure for Cu- and Au-doped BaFe₂As₂

Journal Article · Wed Apr 22 00:00:00 EDT 2020 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648x/ab7e60· OSTI ID:1897873

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

It is noteworthy that chemical substitution of BaFe₂As₂ (122) with the noble elements Cu and Au gives superconductivity with a maximum T_c ≈ 3 K, while Ag substitution (Ag-122) stays antiferromagnetic. For Ba(Fe_1–xTM_x)₂As₂, TM = Cu, Au, or Ag, and by doping an amount of x = 0.04, a-lattice parameter slightly increases (0.4%) for all TM dopants, while c-lattice decreases (–0.2%) for TM = Cu, barely moves (0.05%) for Au, and increases (0.2%) for Ag. Despite the naive expectation that the noble elements of group 11 should affect the quantum properties of 122 similarly, they produce significant differences extending to the character of the ground state. For the Ag-122 crystal, evidence of only a filamentary superconductivity is noted with pressure. However, for Au and Cu doping (x ≈ 0.03) we find a substantial improvement in the superconductivity, with T_c increasing to 7 K and 7.5 K, respectively, under 20 kbar of pressure. As with the ambient pressure results, the identity of the dopant therefore has a substantial impact on the ground state properties. Further, density functional theory calculations corroborate these results and find evidence of strong electronic scattering for Au and Ag dopants, while Cu is comparatively less disruptive to the 122 electronic structure.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1897873

Alternate ID(s):: OSTI ID: 23017827

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 29 Vol. 32; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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