Journal
PHYSICAL REVIEW B
Volume 61, Issue 20, Pages 13325-13328Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.61.R13325
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Temperature variation of the crystal structure has been investigated for TbBaCo2O5+delta (delta=0.5), which shows a metal-insulator (MI) transition at T(MI)approximate to 340 K. The compound has an oxygen-deficient perovskite structure, with alternating CoO6 octahedral and CoO5 pyramidal chains along the crystallographic b axis. We have found that both the pyramids and octahedra are significantly distorted in the insulating phase below T-MI, suggesting a d(3x2-r2)/d(3y2-r2)-type orbital ordering.
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