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Phys Rev Lett. 2008 Oct 24;101(17):177203. Epub 2008 Oct 22.

Multiple metamagnetic transitions in the magnetic refrigerant La(Fe,Si)13Hx.

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IFW Dresden, Institute for Metallic Materials, Dresden, Germany.


The effect of hydrostatic pressure on thermally and field-induced first-order magnetic phase transitions is studied in the La(Fe,Si)_(13)-type compounds. A peculiar series of consecutive field-induced transitions is realized using a distinct combination of hydrostatic pressure and negative pressure created by the interstitial insertion of hydrogen. The pressure-induced discontinuous magnetization jumps result in an enhanced cooling power, thus opening up the possibility to exploit in full the magnetocaloric potential of this compound class.

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