Effects of hydrostatic pressure on magnetostructural transitions and magnetocaloric properties in (MnNiSi)1-x(FeCoGe)x

Tapas Samanta, Louisiana State University
Daniel L. Lepkowski, Louisiana State University
Ahmad Us Saleheen, Louisiana State University
Alok Shankar, Louisiana State University
Joseph Prestigiacomo, Louisiana State University
Igor Dubenko, Southern Illinois University Carbondale
Abdiel Quetz, Southern Illinois University Carbondale
Iain W.H. Oswald, The University of Texas at Dallas
Gregory T. McCandless, The University of Texas at Dallas
Julia Y. Chan, The University of Texas at Dallas
Philip W. Adams, Louisiana State University
David P. Young, Louisiana State University
Naushad Ali, Southern Illinois University Carbondale
Shane Stadler, Louisiana State University


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 -ΔSmax=143.7J/kg K for a field change of ΔB=5T at atmospheric pressure. The first-order magnetostructural transition responsible for the entropy change shifts to lower temperature with applied hydrostatic pressure (∼-10K/kbar) but maintains a large value of -ΔSmax.