Abstract
Neutron diffraction and magnetic studies of a TbBaCo2O5 + γ polycrystalline sample with a perovskite-like layered structure have revealed that spontaneous magnetization appears at 305 K and decreases sharply below 200 K. It has been shown that the crystal structure is described by space group Pmmm with a 2a p · a tp · 2a p unit cell. The magnetic structure in the high-temperature magnetic phase consists of the G-type antiferromagnetic and ferromagnetic components, whereas the magnetic structure in the low-temperature phase is a G-type antiferromagnetic. The ferromagnetic component appears due to the noncollinearity of the magnetic moments of Co3+ ions, which are in the high-spin state in pyramids and in the low-spin state in octahedrons. The antiferromagnetic component is present in the octahedral sublattice, because oxygen vacancies are partially ordered.
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Original Russian Text © I.O. Troyanchuk, D.V. Karpinsky, F. Yokaichiya, 2008, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2008, Vol. 87, No. 10, pp. 627–631.
An erratum to this article is available at http://dx.doi.org/10.1134/S0021364008140178.
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Troyanchuk, I.O., Karpinsky, D.V. & Yokaichiya, F. Magnetic and crystal structures of iron-ion-doped TbBaCo2O5 + γ . Jetp Lett. 87, 541–544 (2008). https://doi.org/10.1134/S0021364008100056
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DOI: https://doi.org/10.1134/S0021364008100056