Local magnetic inhomogeneities inBa(Fe1−xNix)2As2as seen viaA<mml:mprescripts/><mml:none/>75sNMR

2010/08/17 by A. P. Dioguardi, N. apRoberts-Warren, A. C. Shockley +5 · 38 citations
Materials Science · Physics and Astronomy · #Amplitude #Antiferromagnetism #Dopant #Doping #Exponent #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Magnetic moment #Relaxation (psychology) #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.82.140411

published in Physical Review B 82(14) (American Physical Society) · 4 pages, 4 figures

arxiv created 2010/08/17 · openalex publication_date 2010/10/26 · arxiv updated 2010/11/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report ⁷⁵As NMR measurements in BaFe₂As₂ doped with Ni. Like Co, Ni doping suppresses the antiferromagnetic and structural phase transitions and gives rise to superconductivity for sufficiently large Ni doping. The spin-lattice relaxation rate diverges at T_N with a critical exponent consistent with three-dimensional ordering of local moments. In the ordered state the spectra quickly broaden inhomogeneously with doping. We extract the average size of the ordered moment as a function of doping and show that a model in which the order remains commensurate but with local amplitude variations in the vicinity of the dopant fully explains our observations.

Citations

• Problems with reconciling density functional theory calculations with experiment in ferropnictides
• Temperature versus doping phase diagrams forBa(Fe1−xTMx)2As2(TM=Ni,Cu,Cu/Co)single crystals
• As<mml:mprescripts/><mml:none/>75NMR Studies of SuperconductingLaFeAsO0.9F0.1
• Electron-Hole Symmetry and Magnetic Coupling in Antiferromagnetic LaFeAsO
• Evolution from Itinerant Antiferromagnet to Unconventional Superconductor with Fluorine Doping in LaFeAs(O1-xFx) Revealed by 75As and 139La Nuclear Magnetic Resonance
• Commensurate Itinerant Antiferromagnetism in BaFe2As2: 75As-NMR Studies on a Self-Flux Grown Single Crystal
• Homogeneous vs. inhomogeneous coexistence of magnetic order and superconductivity probed by NMR in Co- and K-doped iron pnictides
• 75As NMR Study of the Ternary Iron Arsenide BaFe2As2
• La claridad después de la lluvia: apuntes del natural para el viajero ilustrado y tranquilo
• Superconductivity at 38 K in the Iron Arsenide(Ba1−xKx)Fe2As2

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