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Lattice strain accommodation and absence of pre-transition phases in Ni50Mn25+In25-
R Nevgi1, K R Priolkar1, L Righi2
1Department of Physics, Goa University, Taleigao Plateau, Goa 403206, India.
Abstract:
The stoichiometric Ni50Mn25In25Heusler alloy transforms from a stable ferromagnetic austenitic ground state to an incommensurate modulated martensitic ground state with a progressive replacement of In with Mn without any pre-transition phases. The absence of pre-transition phases like strain glass in Ni50Mn25+In25-alloys is explained to be the ability of the ferromagnetic cubic structure to accommodate the lattice strain caused by atomic size differences of In and Mn atoms. Beyond the critical value ofx= 8.75, the alloys undergo martensitic transformation despite the formation of ferromagnetic and antiferromagnetic clusters and the appearance of a super spin glass state.
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