Lattice strain accommodation and absence of pre-transition phases in Ni${}_{50}$Mn${}_{25+x}$In${}_{25-x}$

Abstract

The stoichiometric Ni${}_{50}$Mn${}_{25}$In${}_{25}$ Heusler 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 Ni${}_{50}$Mn${}_{25+x}$In${}_{25-x}$ 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 of $x$ = 8.75, the alloys undergo martensitic transformation despite the formation of ferromagnetic and antiferromagnetic clusters and the appearance of a super spin glass state.

arXiv commentAppearing in Journal of Physics: Condensed Matter

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Cited by in corpus (3)

• Randomly packed Ni${}_2$MnIn and NiMn structural units in off stoichiometric Ni${}_2$Mn${}_{2-y}$In${}_y$ alloys
• Strain glass versus antisite disorder induced ferromagnetic state in Fe doped Ni-Mn-In Heusler martensites
• Magnetic phase diagram of the austenitic Mn-rich Ni-Mn-(In,Sn) Heusler alloys