Magnetocaloric effect in the ferromagnetic GdNi₄M (M = Al, Si) and antiferromagnetic NdNiAl₄ compounds

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• 作者：T. Toliń ; ski^a ; ^{tomtol@ifmpan.poznan.pl} ; M. Falkowski^a ; K. Synoradzki^a ; A. Hoser^b ; N. Stü ; ß ; er^b
• 关键词：71.20.Lp ; 75.30.Sg ; 75.40.-s ; 61.05.fm
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 May, 2012
• 卷：523
• 期：Complete
• 页码：43-48
• 文件大小：996 K

摘要

Magnetocaloric (MCE) effect has been studied in the ferromagnetic (FM) GdNi₄Al, GdNi₄Si, and the antiferromagnetic (AFM) NdNiAl₄ compounds. All the compounds order magnetically between 9 and 30 K. The maximum magnetic entropy change 鈭捨?em>S_M is in the range of 10-16 J kg^鈭? K^鈭? for the studied RNi₄M compounds. Arrott plots suggest that the phase transition in GdNi₄Al and GdNi₄Si may be of a first order-type. It is ascribed to a field-induced AFM-FM transition. Neutron diffraction experiments on NdNiAl₄ show that its magnetic structure is not of a simple AFM-type. Additionally, the specific heat measurements for NdNiAl₄ reveal a change of the sign of MCE and very small values of 鈭捨?em>S_M and the adiabatic temperature change 螖T_ad.