Persistent magnetism in silver-doped BaFe2As2 crystals

Li, Li; Cao, Huibo; Parker, David S.; Kuhn, Stephen J.; Sefat, Athena S.

doi:10.1103/PhysRevB.94.134510

Persistent magnetism in silver-doped $BaF e_{2} A s_{2}$ crystals

Journal Article · Wed Oct 12 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.134510· OSTI ID:1346673

Li, Li ^[1]; Cao, Huibo ^[2]; Parker, David S. ^[1]; Kuhn, Stephen J. ^[3]; Sefat, Athena S. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Univ. of Notre Dame, IN (United States). Dept. of Physics

Here, we investigate the thermodynamic and transport properties of silver-substituted BaF e ₂ A s ₂ (122) crystals up to ~ 4.5 % . Similar to other transition-metal substitutions in 122, Ag diminishes the antiferromagnetic ( T _N ) and structural ( T S ) transition temperatures, but unlike other electron-doped 122s, T _N and T_S coincide without splitting. Though magnetism drops precipitously to T _N = 84 K at doping x = 0.029 , it only weakly changes above this x , settling at T _N = 80 K at x = 0.045 . Compared to this persistent magnetism in Ag-122, doping other group 11 elements of either Cu or Au in 122 diminished T _N and induced superconductivity near T _c = 2 K at x = 0.044 or 0.031, respectively. Ag-122 crystals show reflective surfaces with surprising thicker cross sections for x ≥ 0.019 , the appearance that is in contrast to the typical thin stacked layered feature seen in all other flux-grown x-122 and lower Ag-122. We found that this physical trait may be a manifest of intrinsic weak changes in c lattice and T _N . Our theoretical calculations suggest that Ag doping produces strong electronic scattering and yet a relatively small disruption of the magnetic state, both of which preclude superconductivity in this system.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725; AC05-06OR23100

OSTI ID:: 1346673

Alternate ID(s):: OSTI ID: 1328721

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 13 Vol. 94; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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