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Mössbauer study of A-site ordered spinel LiFeCr4O8

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Abstract

57Fe Mössbauer spectroscopy of the A-site ordered spinel LiFeCr4O8 has been conducted in order to investigate the local structure and magnetic structure. The paramagnetic spectrum is composed of a singlet, reflecting the cubic local symmetry. Below TN ≈ 94 K, the spectrum becomes a very broad hyperfine sextet, which is interpreted as a distribution of the hyperfine field. The arrangement of the half-filled A-site Fe ions and the breathing pyrochlore Cr ions may produce a wide distribution in the magnetic interaction. Below TMS ≈ 23 K, the spectral shape abruptly changes to a well-resolved sextet, which can be fitted by one component sextet with a very small quadrupole shift. We found that the high-temperature magnetic phase (ferrimagnetic) and the low-temperature magnetic phase (conical) coexist even at 40 K. The spin-gap transition around TSG ≈ 60 K is not observed. The reported decrease in the magnetization below around 50 K may be a result of increasing magnetic anisotropy due to the appearance of the conical magnetic phase.

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Acknowledgements

This work was supported by MEXT Promotion of Distinctive Joint Usage/Research Center for Environmentally Conscious Technologies in Materials Science at ZAIKEN, Waseda University: Support Program Grant Number JPMXP0723833151.

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No funding was received for conducting this study.

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Authors and Affiliations

  1. Department of Science and Engineering, Teikyo University, 320-8551, Utsunomiya, Japan

    Shin Nakamura

  2. Advanced Research Center of Science and Engineering, Waseda University, 169-8555, Shinjuku, Tokyo, Japan

    Shin Nakamura

  3. Faculty of Science and Engineering, Waseda University, 169-8555, Shinjuku, Tokyo, Japan

    Takuro Katsufuji

  4. Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, 169-0051, Shinjyuku, Tokyo, Japan

    Takuro Katsufuji

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  1. Shin Nakamura
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  2. Takuro Katsufuji
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Contributions

S.N. prepared the LiFeCr4O8 specimen and conducted 57Fe Mössbauer spectroscopy. T.K. provided discussions.

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Correspondence to Shin Nakamura.

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Nakamura, S., Katsufuji, T. Mössbauer study of A-site ordered spinel LiFeCr4O8. Hyperfine Interact 245, 7 (2024). https://doi.org/10.1007/s10751-024-01840-1

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