Abstract
Mn1+δAs0.75Sb0.25 samples with excess Mn content of 0.00⩽δ⩽0.11 were synthesized and subjected to the identification of the phases and the magnetic measurements. The stoichiometric Mn1.00As0.75Sb0.25 alloy consisted of two phases with mainly the NiAs-type structure leaving a small amount of Sb as a secondary phase. The samples with δ⩾0.05 formed a single phase with the NiAs-type structure. These results suggest that some Mn atoms occupy the interstitial site of the NiAs-type structure, as observed in the case of Mn1+δSb. The Curie temperature and the magnetic moment were decreased with the increase of the excess Mn content and the transition from a ferromagnetic to paramagnetic state turned much broader. The magnetic entropy change, which is estimated from the magnetization vs. temperature curve, was reduced drastically when δ⩾0.08. No field-induced magnetic transition was observed for δ⩾0.08 in the magnetization curve up to 5T, though the compounds with 0.00⩽δ⩽0.05 exhibited such a transition from a paramagnetic to ferromagnetic state just above TC. These results indicate that interstitial Mn atoms have a significant effect on the magnetism of Mn1+δAs0.75Sb0.25.
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