Role of magnetism in superconductivity of BaFe2As2: Study of 5d Au-doped crystals

Li, Li; Cao, Huibo; McGuire, Michael A.; Kim, J. S.; Stewart, G. R.; Sefat, Athena Safa

doi:10.1103/PhysRevB.92.094504

Role of magnetism in superconductivity of BaFe₂As₂: Study of 5d Au-doped crystals

Journal Article · Wed Sep 09 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.094504· OSTI ID:1286899

Li, Li ^[1]; Cao, Huibo ^[1]; McGuire, Michael A. ^[1]; Kim, J. S. ^[2]; Stewart, G. R. ^[2]; Sefat, Athena Safa ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Florida, Gainesville, FL (United States)

We investigate properties of BaFe₂As₂ (122) single crystals upon gold doping, which is the transition metal with the highest atomic weight. The Au substitution into the FeAs-planes of 122 crystal structure (Au-122) is only possible up to a small amount of ~3%. We find that 5d is more effective in reducing magnetism in 122 than its counter 3d Cu, and this relates to superconductivity. We provide evidence of short-range magnetic fluctuations and local lattice inhomogeneities that may prevent strong percolative superconductivity in Ba(Fe_1-xAu_x)2As₂.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; FG02-86ER45268

OSTI ID:: 1286899

Alternate ID(s):: OSTI ID: 1224601

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 9 Vol. 92; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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