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Enhanced caloric effect induced by magnetoelastic coupling in NiMnGaCu Heusler alloys: Experimental study and theoretical analysis
Zhao, Dewei; Castan, Teresa; Planes, Antoni; Li, Zongbin; Sun, Wen; Liu, Jian
2017
Source PublicationPHYSICAL REVIEW B
Volume96Issue:22
AbstractOn 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.
KeywordShape-memory Alloys Martensitic-transformation Room-temperature Giant Transitions Recovery
Subject AreaChemistry
Language英语
Document Type期刊论文
Identifierhttp://ir.nimte.ac.cn/handle/174433/17482
Collection2017专题
Recommended Citation
GB/T 7714
Zhao, Dewei,Castan, Teresa,Planes, Antoni,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 Zhao, Dewei,Castan, Teresa,Planes, Antoni,Li, Zongbin,Sun, Wen,&Liu, Jian.(2017).Enhanced caloric effect induced by magnetoelastic coupling in NiMnGaCu Heusler alloys: Experimental study and theoretical analysis.PHYSICAL REVIEW B,96(22).
MLA Zhao, Dewei,et al."Enhanced caloric effect induced by magnetoelastic coupling in NiMnGaCu Heusler alloys: Experimental study and theoretical analysis".PHYSICAL REVIEW B 96.22(2017).
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