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A magnetic entropy change ΔS M due to the itinerant-electron metamagnetic (IEM) transition was estimated to be -23 J/kg K around the Curie temperature for La(Fe 0.88 Si 0.12 ) 13 in the magnetic field change from 0 to 5T. In order to control the Curie temperature while keeping such a large value of DS M , hydrogen absorption was carried out. La(Fe 0.88 Si 0.12 ) 13 H 1.0 with T C = 274K shows a large ΔS M due to the IEM transition around room temperature. The adiabatic temperature change ΔT ad from 0 to 2 T is about 7 K, comparable to that of Gd 5 (Ge 0.5 Si 0.5 ) 4 . By changing the hydrogen concentration, the Curie temperature can be controlled from 195 to 336K. It should be noted that the magnitude of ΔS M is almost the same after hydrogen absorption. Therefore, the hydrogenated La(Fe 0.88 Si 0.12 ) 13 H y compounds are promising magnetic refrigerants working in a wide range of temperature.

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Giant Magnetic Entropy Change in Hydrogenated La(Fe&lt;SUB&gt;0.88&lt;/SUB&gt;Si&lt;SUB&gt;0.12&lt;/SUB&gt;)&lt;SUB&gt;13&lt;/SUB&gt;H&lt;SUB&gt;y&lt;/SUB&gt; Compounds