Persistent magnetism in silver-dopedBaFe2As2crystals

2015/09/08 by Li Li, David Parker, Huibo Cao +6
Business, Management and Accounting · Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Corporate Taxation and Avoidance #Crystallography #Doping #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Magnetism #Materials science #Physics #Superconductivity #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.94.134510

published as Phys. Rev. B 94, 134510 (2016) · 13 pages, 7 figures, 1 table

arxiv created 2016/07/11 · openalex publication_date 2016/10/12 · arxiv updated 2016/10/19 · openalex created_date 2020/10/29 · openalex updated_date 2026/08/05

Abstract

We investigate the thermodynamic and transport properties of silver-substituted BaFe₂As₂ (122) crystals up to \ensuremath∼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. Although magnetism drops precipitously to T_N=84\phantom\rule0.16em0exK at doping x=\phantom\rule0.16em0ex0.029, it only weakly changes above this x, settling at T_N=80\phantom\rule0.16em0exK at x=\phantom\rule0.16em0ex0.045. 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\phantom\rule0.16em0exK at x=\phantom\rule0.16em0ex0.044 or 0.031, respectively. Ag-122 crystals show reflective surfaces with surprising thicker cross sections for x\ensuremath≥0.019, the appearance that is in contrast to the typical thin stacked layered feature seen in all other flux-grown x122 and lower Ag-122. 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.

Citations

• Possible highT c superconductivity in the Ba?La?Cu?O system
• Competing magnetic ground states in nonsuperconducting Ba(Fe1−xCrx)2As2as seen via neutron diffraction
• Temperature versus doping phase diagrams forBa(Fe1−xTMx)2As2(TM=Ni,Cu,Cu/Co)single crystals
• Microstructure and superconductivity of Ir-doped BaFe2As2 superconductor
• The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
• Suppression of antiferromagnetic order and orthorhombic distortion in superconductingBa(Fe0.961Rh0.039)2As2
• Superconductivity at 22 K in Co-DopedBaFe2As2Crystals
• Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
• High-temperature superconductivity in iron-based materials
• Bulk synthesis of iron-based superconductors
• Iron-based superconductors: unity or diversity?