Magnetic Structures and Spin States of NdBaCo<sub>2</sub>O<sub>5.5</sub>

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  • Soda Minoru
    Department of Physics, Division of Material Science, Nagoya University
  • Yasui Yukio
    Department of Physics, Division of Material Science, Nagoya University
  • Ito Masafumi
    Department of Physics, Division of Material Science, Nagoya University
  • Iikubo Satoshi
    Department of Physics, Division of Material Science, Nagoya University
  • Sato Masatoshi
    Department of Physics, Division of Material Science, Nagoya University
  • Kakurai Kazuhisa
    Advanced Science Research Center, Japan Atomic Energy Research Institute

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  • Magnetic Structures and Spin States of NdBaCo2O5.5

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Neutron diffraction studies have been carried out on a single crystal of oxygen-deficient perovskite NdBaCo2O5.5 in the temperature (T) range between 7 K and 320 K. We have found a magnetic transition at Tc∼170 K, and a rapid change of the intensities of several reflections at T*∼30 K. The magnetic structures have been analyzed at 7 K (<T*) and 40 K (T*<T<Tc). Non-collinear magnetic structures, which are based on the G-type antiferromagnetic structure, are proposed at these temperatures. In the T region between T* and Tc, Co3+ ions of CoO6 octahedra are in the intermediate spin state, and those of CoO5 pyramids are in the high spin state. In the region of T<T*, the magnitude of the Co3+ spins in the octahedra decreases gradually as T decreases, suggesting that the spin state approaches the low spin state. It is pointed out that the spin state of Co ions depends on the local structure around them.

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