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

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 phas...

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Bibliographic Details
Published inarXiv.org
Main Authors Nevgi, R, Priolkar, K R, Righi, L, Solzi, M, Cugini, F, Dias, E T, Nigam, A K
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 27.08.2020
Subjects
Antiferromagnetism
Cubic lattice
Ferromagnetism
Ground state
Heusler alloys
Lattice strain
Manganese
Martensitic transformations
Nickel
Phases
Physics - Materials Science
Spin glasses
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2008.11982