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Magnetization and specific heat of nanocrystalline rare-earth TbAl2 , TbCu2 and GdAl2 alloys

Abstract: Measurements of the magnetization and specific heat on nanocrystalline TbAl2, TbCu2 and GdAl2 with mean particle diameters below 40 nm show a different behavior from those made on bulk alloys. A reduction of the saturation magnetization quantified in TbAl2 from 8.4 µB/mol for the bulk to 5.8 µB/mol for a 14 nm alloy is attributed to a spin disordered layer on the particle surface. In the specific heat, the lambda anomaly associated to the ferro (?c= 6.6 J/molK, 9.8 J/molK) and to the antiferromagnetic transitions (7.1 J/molK) in the bulk samples, respectively, is smeared out due to finite size effects

 Authorship: Rojas D., Fernández Barquín L., Rodríguez Fernandez J., Espeso J., Gómez Sal J.,

 Fuente: Journal of Physics: Conference Series, 2010, 200, 072080

 Publisher: Institute of Physics

 Year of publication: 2010

 No. of pages: 5

 Publication type: Article

 DOI: 10.1088/1742-6596/200/7/072080

 ISSN: 1742-6588,1742-6596

 Spanish project: MAT 2008-06542-c04-04

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