A study of pressure and chemical substitution effects on the magnetocaloric properties of the ferromagnetic compound UGa2

被引:3
|
作者
da Silva, L. M. [1 ,2 ]
dos Santos, A. O. [1 ,2 ]
Medina, A. N. [3 ]
Coelho, A. A. [1 ]
Cardoso, L. P. [1 ]
Gandra, F. G. [1 ]
机构
[1] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil
[2] Univ Fed Maranhao UFMA, CCSST, Imperatriz, MA, Brazil
[3] Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, Parana, Brazil
基金
巴西圣保罗研究基金会;
关键词
INTERMETALLIC COMPOUND; ELECTRONIC-STRUCTURE; MAGNETIC ENTROPY; ROOM-TEMPERATURE; CRYSTAL-FIELD; HEAT; MNAS1-XSBX; TRANSITION; DYAL2;
D O I
10.1088/0953-8984/21/27/276001
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We report on pressure effects on the magnetic and magnetocaloric properties of the compound UGa2. Using a mean field approximation, we were able to calculate the isothermal entropy change and the adiabatic temperature change. Neither the applied pressure nor the chemical substitution experiments within the ranges studied revealed a remarkable improvement on the magnetocaloric effect (MCE) except for the Al substitutions. Nevertheless, we found that mechanical pressure and chemical pressure are equivalent in terms of the Curie temperature shift when Al, Ge and Si are substituted for Ga, but a different behavior is found when Ni, Fe and Co are used. Our results also show that a composite to operate between 80 and 120 K can be obtained using different concentrations of U(Ga, Ni)(2).
引用
收藏
页数:7
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