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Hawełek, Ł.
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article
Magnetic moments and exchange splitting in Mn3s and Mn2p core levels of magnetocaloric Mn 1.1 Fe 0.9 P 0.6 As 0.4 and Mn 1.1 Fe 0.9 P 0.5 As 0.4 Si 0.1 compounds
Abstract
The magnetocaloric Mn1.1Fe0.9P0.6As0.4 and Mn1.1Fe0.9P0.5As0.4Si0.1 compounds were prepared via spark plasma sintering method. Prepared structural studies including X-ray diffraction measurements have shown the unit cell expanding for silicon substituted sample. The silicon substitution leads also to increase of the adiabatic temperature change from 2.4 K to 3.7 K through the phase transition at 258 K and 268 K in comparison to Mn1.1Fe0.9P0.6As0.4. The magnetic entropy curve showed a complex structure at the field of 5 T. The total saturation of magnetic moments derived from magnetic measurements corresponded to 3.9 μB/f.u. at low temperature. The electronic structure was tested by X-ray photoemission spectroscopy at room temperature and below the phase transition at 180 K. The observed exchange splitting of 2p states of manganese indicated existence of magnetic moments of d electrons and correlate with changes in the valence band measurements. The specific magnetic moments of iron and manganese were deduced from the obtained values of splitting within the 3s levels.