Enhanced caloric effect induced by magnetoelastic coupling in NiMnGaCu Heusler alloys: Experimental study and theoretical analysis

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	Enhanced caloric effect induced by magnetoelastic coupling in NiMnGaCu Heusler alloys: Experimental study and theoretical analysis
	Liu, Jian; Zhao, Dewei; Castan, Teresa; Planes, Antoni; Li, Zongbin; Sun, Wen
刊名	PHYSICAL REVIEW B
	2017
卷号	96 期号:22
关键词	Shape-memory Alloys Martensitic-transformation Room-temperature Giant Transitions Recovery
英文摘要	On the basis of a phenomenological Landau model combined with comprehensive experimental studies, the magnetostructural transition behavior and field induced caloric effects for NiMnGaCu Heusler alloys have been investigated. In Ni50Mn25-xGa25Cux alloys with x = 5.5, 6, and 6.5, both magnetocaloric entropy change (Delta S) and elastocaloric temperature change (Delta T) increase with the increment of Cu content. The maximum Delta S of 1.01 J/molK and Delta T of 8.1 K are obtained for the alloy with x = 6.5. In order to explore the physical origin behind the large caloric effect, here we quantitatively propose a crucial coefficient of magnetoelastic coupling (kappa) over tilde. by utilizing a thermodynamic formalism within the framework of the Landau approach. It has been verified that the enhancement of the strength of magnetoelastic coupling between lattice and magnetic freedoms results in the increased caloric response for NiMnGaCu alloys. Thus, the strengthened coupling of the magnetoelastic effect can be considered as an effective way to improve the caloric performance for these alloys having the same sign of magnetic and elastic entropy changes contributed to the total caloric effect.
学科主题	Chemistry
语种	英语
公开日期	2018-12-04
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/17482]
专题	2017专题
推荐引用方式 GB/T 7714	Liu, Jian,Zhao, Dewei,Castan, Teresa,et al. Enhanced caloric effect induced by magnetoelastic coupling in NiMnGaCu Heusler alloys: Experimental study and theoretical analysis[J]. PHYSICAL REVIEW B,2017,96(22).
APA	Liu, Jian,Zhao, Dewei,Castan, Teresa,Planes, Antoni,Li, Zongbin,&Sun, Wen.(2017).Enhanced caloric effect induced by magnetoelastic coupling in NiMnGaCu Heusler alloys: Experimental study and theoretical analysis.PHYSICAL REVIEW B,96(22).
MLA	Liu, Jian,et al."Enhanced caloric effect induced by magnetoelastic coupling in NiMnGaCu Heusler alloys: Experimental study and theoretical analysis".PHYSICAL REVIEW B 96.22(2017).