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The isostructural alloying of two compounds with extremely different magneticand thermo-structural properties has resulted in a new system,(MnNiSi)1-x(FeCoGe)x, that exhibits extraordinary magnetocaloric propertieswith an acute sensitivity to applied hydrostatic pressure (P). Application ofhydrostatic pressure shifts the first-order phase transition to lowertemperature ($\Delta$ T=-41 K with P=3.43 kbar) but preserves the giant valueof isothermal entropy change (-$\Delta$S$\max$=143.7 J/kg K for a field changeof {\Delta}B=5 T at atmospheric pressure). Together with the magnetic field,this pressure-induced temperature shift can be used to significantly increasethe effective relative cooling power.

Effects of pressure on the magnetostructural and magnetocaloric properties of isostructurally alloyed (MnNiSi)1-x(FeCoGe)x