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Study of the ferrodistorsive orbital ordering in NaNiO2 by neutron diffraction and submillimeter wave ESR

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Abstract:

NaNiO2 has been studied by neutron-powder diffraction, magnetic susceptibility and submillimeter wave ESR. The monoclinic structure at room temperature is characterised by a ferrodistorsive orbital ordering due to the Jahn-Teller (JT) effect of the Ni3+ ions in the low spin state. NaNiO2 undergoes a structural transition at around 480 K, above which the orbital ordering disappears. The high temperature phase is rhombohedral with the layered -NaFeO2 structure ( space group). The magnetic susceptibility exhibits hysteresis and we observe a change of the Curie-Weiss law parameters above the JT transition. The anisotropy of the g-factor at 200 K can be attributed to the JT effect which favours the orbital occupation. Finally, the interplay between the magnetic and structural properties of NaNiO2 and Li1-xNi1+xO2 is discussed.

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Authors and Affiliations

  1. Grenoble High Magnetic Field Laboratory, CNRS and MPI-FKF, BP 166X, 38042 Grenoble, France, , , , , , FR

    E. Chappel, M.D. Núñez-Regueiro & G. Chouteau

  2. Laboratoire de Cristallographie, CNRS, BP 166X, 38042 Grenoble, France, , , , , , FR

    O. Isnard & C. Darie

Authors
  1. E. Chappel
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  2. M.D. Núñez-Regueiro
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  3. G. Chouteau
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  4. O. Isnard
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  5. C. Darie
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Received 29 May 2000

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Chappel, E., Núñez-Regueiro, M., Chouteau, G. et al. Study of the ferrodistorsive orbital ordering in NaNiO2 by neutron diffraction and submillimeter wave ESR. Eur. Phys. J. B 17, 615–622 (2000). https://doi.org/10.1007/s100510070099

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  • DOI: https://doi.org/10.1007/s100510070099

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