Abstract
The magnetic field and temperature dependences of the adiabatic temperature change (Δ T) were measured in single-crystalline and polycrystalline gadolinium (Gd) near the Curie point ( T C) by a direct method while continuously changing magnetic field ( H) at different rates and the more conventional stepping of the magnetic field from 0 to 1.2 T. The Δ T( H) behavior has a tendency towards saturation at high magnetic fields, which is similar for both the polycrystal and the single crystal (in the latter case, the magnetic field vectors was parallel to the c-axis of the crystal). The Curie temperature of Gd was determined from Belov–Goryaga (Arrott) plots using isothermal magnetization data and a similar technique using adiabatic temperature change isotherms. In the latter case, T C was about 9 K higher than in the first case. Possible reasons for the observed difference are discussed.
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