2015/02/06 by Wentao Jin, W. T. Jin, Wei Li +19
Chemistry · Materials Science · Physics and Astronomy · #Atomic physics #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Ferromagnetism #Ground state #Iron-based superconductors research #Magnetic moment #Neutron diffraction #Order (exchange) #Orthorhombic crystal system #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Spins #Superconductivity #Tetragonal crystal system #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.91.064506
published as Phys. Rev. B 91, 064506 (2015) · 7 pages, 7 figures, accepted for publication in Physical Review B
arxiv created 2015/02/06 · openalex publication_date 2015/02/17 · arxiv updated 2015/02/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The magnetic order of the localized Eu2+ spins in optimally doped Eu(Fe_1\ensuremath-xIrx)2As2 (x=0.12) with superconducting transition temperature TSC=22 K was investigated by single-crystal neutron diffraction. The Eu2+ moments were found to be ferromagnetically aligned along the c direction with an ordered moment of 7.0(1) \ensuremathμB well below the magnetic phase transition temperature TC=17 K. No evidence of the tetragonal-to-orthorhombic structural phase transition was found in this compound within the experimental uncertainty, in which the spin-density-wave (SDW) order of the Fe sublattice is supposed to be completely suppressed and the superconductivity gets fully developed. The ferromagnetic ground state of the Eu2+ spins in Eu(Fe0.88Ir0.12)2As2 was supported by the first-principles density functional calculation. In addition, comparison of the electronic structure calculations between Eu(Fe0.875Ir0.125)2As2 and the parent compound EuFe2As2 indicates stronger hybridization and more expanded bandwidth due to the Ir substitution, which together with the introduction of electrons might work against the Fe-SDW in favor of the superconductivity.