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In accordance with magnetization studies, the fast-cooled TbBaCo 2 O 5.4 is characterized by spontaneous magnetization around 0.18 B per cobalt ion, which develops below T N ‫ס‬ 245 K. The neutron diffraction study of this compound revealed that magnetic moments of Co 3+ ions adopting intermediate spine state are ordered antiferromagnetically. Both magnetization and neutron diffraction study showed that there is a spin reorientation process in the wide temperature range. The crystal and magnetic structures are discussed.

The formulas for magnetic cross sections, I and II , have an incorrect prefactor ͑we thank J.-M. Mignot for pointing this out͒, and the square root in the equation for II on page R14 623 should not be there. Therefore, Eq. ͑3͒ on page R14 622 should be replaced byThe equation on page R14 623 and the two sentences after it should be corrected as follows:Thus II (q)ϭ I (q)/2, and model I and model II cannot be distinguished in the diffraction. However, we prefer model I since a collinear magnetic modulation ͑model II͒ usually squares up with lowering temperature, generating higher order harmonics. The staggered moment at 1.4 K should be 0.75(2) B per Ce, instead of 0.264(4) B per Ce. Other conclusions of the paper are not affected. PHYSICAL REVIEW B 67, 099903͑E͒ ͑2003͒