Magnetic Structures of High Temperature Phases of TbBaCo2O5.5

Details Magnetic Structures of High Temperature Phases of TbBaCo2O5.5 Magnetic Structures of High Temperature Phases of TbBaCo2O5.5

2003-01-31

arxiv.org/abs/cond-mat/0301618v2

J. Phys. Soc. Jpn. 72 (2003) No.7

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 2 tables, 10 figures

Scientific paper

10.1143/JPSJ.72.1729

Neutron diffraction studies have been carried out on a single crystal of oxygen-deficient perovskite TbBaCo2O5.5 in the temperature range of 7-370 K. There have been observed several magnetic or structural transitions. Among these, the existence of the transitions to the insulating phase from the metallic one at ~340 K, to the one with the ferromagnetic moment at ~280 K and possibly to the antiferromagnetic one at ~260 K, with decreasing temperature T correspond to those reported in former works. We have studied the magnetic structures at 270 K and 250 K and found that all Co3+ ions of the CoO6 octahedra are in the low spin state and those of the CoO5 pyramids carry spins which are possibly in the intermediate spin state. Non-collinear magnetic structures are proposed at these temperatures. Two other transitions have also been observed at the temperatures, ~100 K and ~250 K.

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