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Small-angle neutron scattering and magnetically heterogeneous state in Sr2FeMoO6–δ

Nikolay Kalanda; Vasil Garamus; Mikhail Zheludkevich; Marta Yarmolich; Maria Serdechnova; Dietmar Christian Florian Wieland; Alexander Petrov; Aliaksandr Zhaludkevich; Nikolai A. Sobolev

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Nikolay Kalanda</dc:creator>
  <dc:creator>Vasil Garamus</dc:creator>
  <dc:creator>Mikhail Zheludkevich</dc:creator>
  <dc:creator>Marta Yarmolich</dc:creator>
  <dc:creator>Maria Serdechnova</dc:creator>
  <dc:creator>Dietmar Christian Florian Wieland</dc:creator>
  <dc:creator>Alexander Petrov</dc:creator>
  <dc:creator>Aliaksandr Zhaludkevich</dc:creator>
  <dc:creator>Nikolai A. Sobolev</dc:creator>
  <dc:description>Single-phase strontium ferromolybdate (Sr2FeMoO6–δ) samples with different degrees of the superstructural ordering of the Fe/Mo cations were obtained from partially reduced SrFeO3–х, SrMoO4 precursors by the solid-state technology. The study of the temperature dependences of the magnetization measured in the field-cooling and zero-field-cooling regimes indicated an inhomogeneous magnetic state of the samples. The presence of magnetic regions of different nature has also been revealed by the small-angle neutron scattering. For the Sr2FeMoO6–δ samples with different superstructural ordering of the Fe/Mo cations and for all values of the magnetic field induction in the range up to 1.5 T and of the scattering vector in the interval 0.1 &gt;q &gt;0.005 Å–1, the analytical dependence I ~ q–α obeys the Porod law (α ≈ 4), which corresponds to an object with a smooth and well-marked surface and polydisperse grain size. Deviations from the Porod law in the q &gt; 0.1 Å–1 region and a weakening of the neutron scattering in applied magnetic fields may be ascribed to magnetic inhomogeneities with diameters D &lt;6 nm, which are partially destroyed /oriented by magnetic fields В ≥1.5 T. </dc:description>
  <dc:subject>strontium ferromolybdate</dc:subject>
  <dc:subject>superstructure ordering</dc:subject>
  <dc:subject>oxygen non-stoichiometry</dc:subject>
  <dc:subject>small-angle neutron scattering</dc:subject>
  <dc:title>Small-angle neutron scattering and magnetically heterogeneous state in Sr2FeMoO6–δ</dc:title>
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