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Mössbauer study of NH4FeCl3: A quasi one-dimensional magnet

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Abstract

NH4FeCl3 is a quasi one-dimensional magnet. Mössbauer spectra of powder samples of NH4FeCl3 have been recorded in the temperature range 1.3 to 250 K. The structural phase change between 10 and 30 K was not accompanied by changes in the Mössbauer spectra. Apparently, the changes in the local environment of the Fe2+ ions are not sufficient to affect the quadrupole splitting. The Mössbauer spectrum at 1.3 K, belowT N=1.7(2) K, is magnetically split, but cannot be fitted to just one iron site. It appears to be a superposition of at least two broadened spectra, one with an internal fieldB=4.7(1) T perpendicular to the principalz-axis of the electric field gradient, the other with zero field. The intensity for these sites was found to be 3.3∶1. The fit is improved if slow relaxation is allowed between the two sites. Broadening of the lines starts to occur at 6 K, well aboveT N. This has not been reported for the other members of the AFeX3 group.

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Author notes

  1. Q. A. Pankhurst

    Present address: Department of Physics and Astronomy, University College London, WC1E 6BT, London, England

Authors and Affiliations

  1. Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand

    N. I. Sheen & V. H. McCann

  2. Department of Physics, University of Liverpool, L69 3BX, Liverpool, England

    Q. A. Pankhurst

Authors
  1. N. I. Sheen
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  2. V. H. McCann
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  3. Q. A. Pankhurst
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Sheen, N.I., McCann, V.H. & Pankhurst, Q.A. Mössbauer study of NH4FeCl3: A quasi one-dimensional magnet. Hyperfine Interact 93, 1547–1551 (1994). https://doi.org/10.1007/BF02072907

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