Synthesis, Crystal Structure and Magnetism of Eu3Sc2O5Fe2As2

Franziska Hummel; Marcus Tegel; Birgit Gerke; Rainer Pöttgen; Dirk Johrendt

Synthesis, Crystal Structure and Magnetism of Eu3Sc2O5Fe2As2

Strongly Correlated Electrons 2015-06-10 v1

Authors: Franziska Hummel , Marcus Tegel , Birgit Gerke , Rainer Pöttgen , Dirk Johrendt

Abstract

The iron arsenide Eu3Fe2O5Fe2As2 was synthesized at 1173-1373 K in a resistance furnace and characterized by X-ray powder diffraction with Rietveld analysis: Sr3Fe2O5Cu2S2-type, I4/mmm, a = 406.40(1) pm, c = 2646.9(1) pm. Layers of edge-sharing FeAs4/4 tetrahedra are separated by perovskite-like oxide blocks. No structural transition occurs in the temperature range from 10 to 300 K. Magnetic measurements have revealed Curie-Weiss behavior with an effective magnetic moment of 7.79 muB per europium atom in agreement with the theoretical value of 7.94 muB for Eu2+. A drop in the magnetic susceptibility at 5 K indicates possible antiferromagnetic ordering. 151Eu and 57Fe M\"ossbauer spectroscopic measurements have confirmed a beginning cooperative magnetic phenomenon by showing significantly broadened spectra at 4.8 K compared to those at 78 K.

Keywords

crystal synthesis crystal structure magnetism iron arsenide Rietveld analysis Mössbauer spectroscopy antiferromagnetic ordering

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@article{arxiv.1506.02925,
  title  = {Synthesis, Crystal Structure and Magnetism of Eu3Sc2O5Fe2As2},
  author = {Franziska Hummel and Marcus Tegel and Birgit Gerke and Rainer Pöttgen and Dirk Johrendt},
  journal= {arXiv preprint arXiv:1506.02925},
  year   = {2015}
}

Synthesis, Crystal Structure and Magnetism of Eu3Sc2O5Fe2As2

Abstract

Keywords

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