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Antiferromagnetism in Pressure-Amorphized Fe2SiO4.

M B Kruger, R Jeanloz, M P Pasternak

    Science (New York, N.Y.)
    |February 7, 1992
    PubMed
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    Amorphous iron silicate (Fe(2)SiO(4)) shows a magnetic transition temperature identical to its crystalline form. This finding challenges typical behaviors observed in other disordered magnetic systems.

    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Magnetism

    Background:

    • Disordered systems often display unique magnetic properties due to spin frustration.
    • The Néel transition temperature in amorphous materials typically differs from their crystalline counterparts.

    Purpose of the Study:

    • To investigate the magnetic properties of amorphous iron silicate (Fe(2)SiO(4)) synthesized under high pressure.
    • To compare the magnetic transition temperature of amorphous Fe(2)SiO(4) with its crystalline form.

    Main Methods:

    • Synthesis of amorphous Fe(2)SiO(4) at elevated pressures.
    • Measurement of magnetic properties, specifically the Néel transition temperature (T(N)).

    Main Results:

    • Amorphous Fe(2)SiO(4) exhibits a Néel transition at 65 (+/-2) Kelvin at zero pressure.

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  • This transition temperature is identical to that observed in crystalline Fe(2)SiO(4).

    • Conclusions:

    • The magnetic behavior of amorphous Fe(2)SiO(4) is unusual compared to other disordered magnetic systems.
    • Spin frustration does not significantly suppress the Néel transition in this amorphous iron silicate.