Crystal structure and magnetic modulation in beta-Ce2O2FeSe2

Abstract

We report a combination of X-ray and neutron diffraction studies, Mossbauer spectroscopy and muon spin relaxation (muSR) measurements to probe the structure and magnetic properties of the semiconducting beta-Ce2O2FeSe2 oxychalcogenide. We report a new structural description in space group Pna21 which is consistent with diffraction data and second harmonic generation measurements and reveal an order-disorder transition on one Fe site at TOD ~ 330 K. Susceptibility measurements, Mossbauer and muSR reveal antiferromagnetic ordering below TN = 86 K and more complex short range order above this temperature. 12 K neutron diffraction data reveal a modulated magnetic structure with q = 0.444 bN*.

29 pages

References in corpus (8)

• The Structural Phase Transition in FeSe (Fe1+dSe)
• Spin-polarized muons in condensed matter physics
• Moessbauer spectroscopy evidence for the lack of iron magnetic moment in superconducting FeSe
• Incommensurate spin density wave in Co-doped BaFe2As2
• Mossbauer studies on FeSe and FeTe
• The magnetic and electronic properties of Oxyselenides - influence of transition metal ions and lanthanides
• Magnetism of the Fe${}^{2+}$ and Ce${}^{3+}$ sublattices in Ce${}_2$O${}_2$FeSe${}_2$: a combined neutron powder diffraction, inelastic neutron scattering and density functional study
• Incommensurate Spin Density Wave versus local magnetic inhomogeneities in Ba(Fe1-xNix)2As2: a 57Fe Mossbauer spectroscopy study