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Competing magnetic interactions in Na10Co4O10, studied by neutron diffraction
Norbert Stüsser1, Mikhail Sofin, Roland Bircher
1Hahn-Meitner-Institut, Glienicker Strasse 100, 14109 Berlin, Germany.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 10, 2006
Summary
Sodium cobaltate Na(10)Co(4)O(10) exhibits antiferromagnetic ordering below 37 K. Neutron diffraction reveals a collinear spin structure with low ordered magnetic moments, forming ferromagnetic layers coupled antiferromagnetically.
Area of Science:
- Solid State Chemistry
- Materials Science
- Magnetism
Background:
- Na(10)Co(4)O(10) is a complex oxide with potential magnetic properties.
- Previous X-ray diffraction studies established its crystal structure.
Purpose of the Study:
- To investigate the magnetic ordering and spin structure of Na(10)Co(4)O(10) using neutron powder diffraction.
- To confirm the crystal structure and determine the magnetic properties at low temperatures.
Main Methods:
- Neutron powder diffraction at 230 K, 70 K, and 4 K.
- Rietveld refinement in the Shubnikov space group C2/c.
- Representation analysis.
Main Results:
- Confirmed the crystal structure of Na(10)Co(4)O(10).
- Observed antiferromagnetic ordering below 37 K with a collinear spin structure (q=0).
- Determined low ordered magnetic moments for Co(III) (2.43(5) μB) and Co(II) (2.11(6) μB).
- Identified ferromagnetic layers parallel to the ab plane, coupled antiferromagnetically along c.
- Observed spontaneous magnetization due to a 2.2-degree spin canting, indicating a weak ferromagnetic component along b.
Conclusions:
- The spin arrangement is consistent with intratetramer interactions, with parallel central Co(III) moments and antiparallel terminal Co(II) moments.
- The magnetic structure features ferromagnetic layers with antiferromagnetic interlayer coupling.
- A slight spin canting leads to weak ferromagnetism below the ordering temperature.
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