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Magnetic and neutron diffraction study on melilite-type oxides Sr2MGe2O7 (M = Mn, Co).

Takashi Endo1, Yoshihiro Doi, Yukio Hinatsu

  • 1Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan. t-endo38232@mail.sci.hokudai.ac.jp

Inorganic Chemistry
|March 2, 2012
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Melilite-type oxides Sr(2)MGe(2)O(7) with M=Mn, Co exhibit distinct antiferromagnetic transitions. Neutron diffraction revealed specific magnetic structures for manganese and cobalt ions, highlighting 2D magnetic interactions.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Magnetism

Background:

  • Melilite-type oxides with the formula Sr(2)MGe(2)O(7) (M = Mn, Co) are investigated.
  • These compounds crystallize in the melilite structure (space group P ̅42(1)m) with ordered M and Ge ions on tetrahedral sites.
  • The magnetic M ions form a square-planar lattice in the ab plane.

Purpose of the Study:

  • To investigate the crystal structures and magnetic properties of Sr(2)MGe(2)O(7) (M = Mn, Co).
  • To determine the magnetic ordering and structure of these materials at low temperatures.

Main Methods:

  • Crystal structure analysis.
  • Magnetic susceptibility measurements as a function of temperature.
  • Neutron powder diffraction at 2.5 K to determine magnetic structure.

Main Results:

  • Both Sr(2)MnGe(2)O(7) and Sr(2)CoGe(2)O(7) do not exhibit structural phase transitions down to 2.5 K.
  • Sr(2)MnGe(2)O(7) shows a broad magnetic susceptibility peak at ~6.0 K due to 2D magnetic interactions, with an antiferromagnetic transition at 4.4 K. Its Mn(2+) moments (3.99 μB) order antiferromagnetically along the c axis (k = (0, 0, 1/2)).
  • Sr(2)CoGe(2)O(7) exhibits an antiferromagnetic transition at 6.5 K. Its Co(2+) moments (2.81 μB) adopt a collinear arrangement in the ab plane (k = (0, 0, 0)).

Conclusions:

  • The study elucidates the distinct magnetic behaviors and structures of melilite-type Sr(2)MnGe(2)O(7) and Sr(2)CoGe(2)O(7).
  • The magnetic Mn(2+) ions order antiferromagnetically along the c-axis, while Co(2+) ions order collinearly in the ab plane.
  • The findings contribute to understanding magnetic interactions in square-planar lattice systems within the melilite structure.