NMR study of pressure-induced phase transition in Mn3Ga1−Al C (x=0.02)

Abstract An NMR study of the antiferromagnetic (AF)–ferromagnetic (F) transition in Mn 3 Ga 1− x Al x C ( x =0.02) has been made under pressure up to 17 kbar at 4.2 and 195 K. Besides broad 55 Mn NMR at 290 and 110 MHz for the AF and F states, a quadrupolar split 55 Mn NMR is observed in the intermediate(I) state between the AF and F ones. The NMR results at 4.2 K show that the pressure induces the AF–I transition, but no I–F transition up to 17 kbar.