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- W2488396567 abstract "The magnetocaloric effect (MCE) of the compound ${text{Er}}_{5}{text{Si}}_{4}$ has been investigated as a function of the applied magnetic field (up to 50 kOe) and the hydrostatic pressure (from ambient pressure up to 9 kbar). At constant magnetic field change, increasing the pressure up to 1.4 kbar induces a global rise of the magnetic entropy change, $|ensuremath{Delta}{S}_{text{mag}}|$, with the peak at ${T}_{C}ensuremath{cong}30text{ }text{K}$ growing from 14.9 to $20.1text{ }text{J}/text{kg}text{ }text{K}$. Between 1.4 and 9 kbar, the size and shape of the $|ensuremath{Delta}{S}_{text{mag}}|$ vs $T$ curve remain nearly constant but the peak moves to higher temperatures and stabilizes above 3.5 kbar at $Tensuremath{sim}36text{ }text{K}$. Contrary to many other ${R}_{5}{({text{Si}}_{x}{text{Ge}}_{1ensuremath{-}x})}_{4}$ compounds, the magnetocaloric effect in ${text{Er}}_{5}{text{Si}}_{4}$ does not originate from the simultaneous field-induced magnetic and structural transformations since previous studies of the compound have demonstrated that moderate steady magnetic fields are not strong enough to induce the $Mensuremath{rightarrow}O(text{I})$ transformation at the atmospheric pressure. However, the pressure dependence of the MCE is associated with pressure-induced $Mensuremath{rightarrow}O(text{I})$ structural transformation that takes place in ${text{Er}}_{5}{text{Si}}_{4}$. The increase in the magnetic entropy change occurs because of a modification of the magnetic coupling derived from the differences in the interlayer bonding in the $M$ and $O(text{I})$ states. This gives rise to an enhancement of the ferromagnetic interactions in the $O(text{I})$ phase with respect to the ambient pressure $M$ state, resulting in a stronger saturation magnetization and a higher Curie temperature, i.e., ${T}_{C}^{M}=30text{ }text{K}$ and ${T}_{C}^{O(text{I})}=36text{ }text{K}$." @default.
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- W2488396567 date "2009-04-28" @default.
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- W2488396567 title "Magnetocaloric effect of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>Er</mml:mtext></mml:mrow><mml:mn>5</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Si</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>under hydrostatic pressure" @default.
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- W2488396567 doi "https://doi.org/10.1103/physrevb.79.144430" @default.
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