Magnetic properties of GdBaCo2O5.5−δ single crystals

The layered perovskite compounds REBaCo2O5.5−δ (RE Rare Earth) display interesting magnetic properties arising from the variable spin states of the Co ions. There is a competition between the antiferromagnetic and ferromagnetic ordering in these materials. These compounds also allow a wide variation...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-01, Vol.200 (1), p.012104
Main Authors: Liao, Da-qian, Lees, M R, Balakrishnan, G, Paul, D McK
Format: Article
Language:English
Subjects:
Annealing
Antiferromagnetism
Crystal growth
Crystal structure
Ferromagnetic materials
Magnetic properties
Magnetism
Oxygen
Perovskites
Physics
Single crystals
Stoichiometry
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Summary:The layered perovskite compounds REBaCo2O5.5−δ (RE Rare Earth) display interesting magnetic properties arising from the variable spin states of the Co ions. There is a competition between the antiferromagnetic and ferromagnetic ordering in these materials. These compounds also allow a wide variation of oxygen stoichiometry to tune the magnetic properties. Single crystals of GdBaCo2O5.5−δ have been grown by the floating-zone technique in air. The as-grown crystal displays a twinned structure. Oriented crystals isolated from the as-grown boule were annealed in a flow of oxygen to vary the oxygen stoichiometry. Magnetization measurements have been carried out on both as-grown and annealed crystals. Results of the specific heat of GdBaCo2O5.56 crystals as well as the magnetic properties studied as a function of applied pressures (0 to 8 kbar) are presented.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/200/1/012104