Neutron investigation of the magnetic scattering in an iron-based ferromagnetic superconductor

Abstract

Neutron diffraction and small angle scattering experiments have been carried out on the double-isotopic polycrystalline sample (7Li0.82Fe0.18OD)FeSe. Profile refinements of the diffraction data establish the composition and reveal an essentially single phase material with lattice parameters of a= 3.7827 Å and c= 9.1277 Å at 4 K, in the ferromagnetic-superconductor regime, with a bulk superconducting transition of TC = 18 K. Small angle neutron scattering (SANS) measurements in zero applied field reveal the onset of ferromagnetic order below TF ~ 12.5 K, with a wave vector and temperature dependence consistent with an inhomogeneous ferromagnet of spontaneous vortices or domains in a mixed state. No oscillatory long range ordered magnetic state is observed. Field dependent measurements establish a separate component of magnetic scattering from the vortex lattice, which occurs at the expected wave vector. The temperature dependence of the vortex scattering does not indicate any contribution from the ferromagnetism, consistent with diffraction data that indicate that the ordered ferromagnetic moment is quite small.

10 pages, 4 figures

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• Superconductivity and magnetism in Iron Sulfides Intercalated by Metal Hydroxides
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• Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
• The magnetic and electronic properties of Oxyselenides - influence of transition metal ions and lanthanides
• Spin resonance in the superconducting state of Li${}_{1-x}$Fe${}_x$ODFe${}_{1-y}$Se observed by neutron spectroscopy
• Basic electronic properties of iron selenide under variation of structural parameters
• Coexistence of magnetism and superconductivity in separate layers of the iron-based superconductor Li_{1-x}Fe_{x}(OH)Fe_{1-y}Se
• Electronic phase separation in iron selenide (Li, Fe)OHFeSe superconductor system
• Long range magnetic order in hydroxide layer doped (Li${}_{1-x-y}$Fe${}_x$Mn${}_y$OD)FeSe
• Electronic and Superconducting Properties of Some FeSe-based Single Crystals and Films Grown Hydrothermally