Effects of Hydrostatic Pressure on Magnetostructural Transitions and Magnetocaloric Properties in (MnNiSi)₁₋ₓ (FeCoGe)ₓ



The isostructural alloying of two compounds with different magnetic and thermo-structural properties has resulted in a new system, (MnNiSi)(1-x)(FeCoGe)(x), that exhibits large magnetocaloric effects with acute sensitivity to both compositional variation and applied hydrostatic pressure. The maximum isothermal entropy change reaches a value of -Delta S-max - 143.7 J/kg K for a field change of Delta B - 5 T at atmospheric pressure. The first-order magnetostructural transition responsible for the entropy change shifts to lower temperature with applied hydrostatic pressure (similar to-10 K/kbar) but maintains a large value of -Delta S-max.



Magnetic materials, Crystals--Structure, Curie temperature, Entropy, Hydrostatics


"This work was supported by the European Regional Development Fund (ERDF) through the Ireland Wales Programme (INTERREG 4A). DR acknowledges the support of the Russian Foundation for basic Research through grant 10-01-93112."


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