The Influence Of Au Substitution And Hydrostatic Pressure On The Phase Transitions And Magnetocaloric Properties Of Mncoge Alloys

In this work, the phase transitions and magnetocaloric properties of Mn1 - xAuxCoGe (0 <= x <= 0.025) alloys were studied as a function of concentrationx and applied hydrostatic pressure. The increasing substitution of Au for Mn results in the decrease of the first-order martensitic transition temperature, and this first-order martensitic transition was ultimately converted to a second-order magnetic transition when the Au substitution (x) reached 0.025. The magnitudes of the maximum magnetic entropy changes increased when the magnetic and structural transitions were coupled, which occurred for0.005 <= x <= 0.020. The largest maximum magnetic entropy change for a field change ofmu 0 Delta H = 7T was 33.1J/kgK for the sample withx = 0.020. Similar to the effect of Au substitution, the first-order martensitic transition temperature initially decreased, and then converted to second order, when the applied hydrostatic pressure reached a large enough value. Interestingly, both Au substitution and pressure application cause a volume reduction and, in both cases, the first-order martensitic transition temperature initially reduced and then converted to second-order. These results suggest two different methods of tuning the transition temperatures in these magnetocaloric materials. One can either apply hydrostatic pressure and temporarily adjust the transition temperatures or modify the composition chemically and permanently change the transition temperatures.