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Type: Artigo
Title: Deciphering M-t Diagram Of Shape Memory Heusler Alloys: Reentrance, Plateau And Beyond
Author: Sergeenkov
S.; Cordova
C.; Ari-Gur
P.; Koledov
V. V.; Kamantsev
A. P.; Shavrov
V. G.; Mashirov
A. V.; Gomes
A. M.; Takeuchi
A. Y.; de Lima
O. F.; Araujo-Moreira
F. M.
Abstract: We present our recent results on temperature behaviour of magnetization observed in Ni47Mn39In14 Heusler alloys. Three regions can be distinguished in the M-T diagram: (I) low temperature martensitic phase (with the Curie temperature TCM = 140 K), (II) intermediate mixed phase (with the critical temperature TMS = 230 K) exhibiting a reentrant like behavior (between TCM and TMS) and (III) high temperature austenitic phase (with the Curie temperature TCA = 320 K) exhibiting a rather wide plateau region (between TMS and TCA). By arguing that powerful structural transformations, causing drastic modifications of the domain structure in alloys, would also trigger strong fluctuations of the order parameters throughout the entire M-T diagram, we were able to successfully fit all the data by incorporating Gaussian fluctuations (both above and below the above three critical temperatures) into the Ginzburg-Landau scenario.
Subject: Heusler Alloys
Magnetic And Martensitic Phase Transitions
Gaussian Fluctuations
Editor: Taylor & Francis Ltd
Rights: fechado
Identifier DOI: 10.1080/09500839.2016.1225995
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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