Abstract
With the help of the Landau–Devonshire theory, in this paper we produce agood phenomenological description of the first-order magnetocrystallinetransition that occurs in the Gd5(SixGe1−x)4(0.24≤x≤0.5)alloys, and derive the magnetic phase diagram in a magnetic field versustemperature presentation. The description reproduces not only the field-inducedmagnetic transition and the temperature-induced transition, but also themagnetic hysteresis and the thermal hysteresis. Also, it gives the critical externalfield and the critical temperature for the magnetic hysteresis and the thermalhysteresis.
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