Title:
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Martensitic transition and magnetoresistance in Cu-Al-Mn shape-memory alloy: Influence of ageing
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Author:
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Marcos, Jordi; Planes Vila, Antoni; Mañosa, Lluís; Labarta, Amílcar; Hattink, Bart Jan
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Other authors:
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Universitat de Barcelona |
Abstract:
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We have studied the effect of ageing within the miscibility gap on the electric, magnetic, and thermodynamic properties of a nonstoichiometric Heusler Cu-Al-Mn shape-memory alloy, which undergoes a martensitic transition from a bcc-based structure (b phase! towards a close-packed structure (M phase!. Negative magnetoresistance that shows an almost linear dependence on the square of magnetization with different slopes in the M and b phases was observed. This magnetoresistive effect has been associated with the existence of Mn-rich clusters with the Cu2AlMn structure. The effect of an applied magnetic field on the martensitic transition has also been studied. The entropy change between the b and M phases shows negligible dependence on the magnetic field, but it decreases significantly with annealing time within the miscibility gap. Such a decrease is due to the increasing amount of Cu2MnAl-rich domains that do not transform martensitically. |
Subject(s):
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-Transformacions martensítiques -Magnetoresistència -Aliatges -Martensitic transformations -Magnetoresistance -Alloys |
Rights:
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(c) The American Physical Society, 2002
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Document type:
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Article Article - Published version |
Published by:
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The American Physical Society
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