Coupling between phase transitions and glassy magnetic behaviour in Heusler Alloy Ni50Mn34In8Ga8

Zhang, Le and Lou, Xiaojie and Zhou, Chao and Yang, Sen and Ren, Xiaobing and Wang, Danyang and Carpenter, Michael A (2020) Coupling between phase transitions and glassy magnetic behaviour in Heusler Alloy Ni50Mn34In8Ga8. Journal of Physics: Condensed Matter. ISSN 0953-8984, 1361-648X DOI https://doi.org/10.1088/1361-648X/ab7f04

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Abstract

The transition sequence in the Heusler alloy Ni50Mn34In8Ga8 has been determined from measurements of elasticity, heat flow and magnetism to be paramagnetic austenite → paramagnetic martensite → ferromagnetic martensite at ~335 and ~260 K, respectively, during cooling. The overall pattern of elastic stiffening/softening and acoustic loss is typical of a system with bilinear coupling between symmetry breaking strain and the driving order parameter in a temperature interval below the transition point in which ferroelastic twin walls remain mobile under the influence of external stress. Divergence between zero-field-cooling (ZFC) and field-cooling (FC) determinations of DC magnetisation below ~220 K indicates that a frustrated magnetic glass develops in the ferromagnetic martensite. An AC magnetic anomaly which shows Vogel-Fulcher dynamics in the vicinity of ~160 K is evidence of a further glassy freezing process. This coincides with an acoustic loss peak and slight elastic stiffening that is typical of the outcome of freezing of ferroelastic twin walls. The results indicate that local strain variations associated with the ferroelastic twin walls couple with local moments to induce glassy magnetic behaviour.

Item Type:	Article
Uncontrolled Keywords:	2020AREP; IA76
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences 07 - Gold Open Access
Journal or Publication Title:	Journal of Physics: Condensed Matter
Identification Number:	https://doi.org/10.1088/1361-648X/ab7f04
Depositing User:	Sarah Humbert
Date Deposited:	09 Apr 2020 22:09
Last Modified:	09 Apr 2020 22:09
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4671

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