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).
机构:
Capital Normal Univ, Dept Phys, Beijing 100048, Peoples R ChinaCapital Normal Univ, Dept Phys, Beijing 100048, Peoples R China
Dong, Q. Y.
Wang, L. C.
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Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100190, Peoples R ChinaCapital Normal Univ, Dept Phys, Beijing 100048, Peoples R China
Wang, L. C.
Chen, J.
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China Aerosp Sci & Technol Corp, Beijing Inst Aerosp Testing Technol, Beijing 100074, Peoples R ChinaCapital Normal Univ, Dept Phys, Beijing 100048, Peoples R China
Chen, J.
Zhang, X. Q.
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Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100190, Peoples R ChinaCapital Normal Univ, Dept Phys, Beijing 100048, Peoples R China
Zhang, X. Q.
Sun, J. R.
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Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100190, Peoples R ChinaCapital Normal Univ, Dept Phys, Beijing 100048, Peoples R China
Sun, J. R.
Shen, B. G.
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Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100190, Peoples R ChinaCapital Normal Univ, Dept Phys, Beijing 100048, Peoples R China
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Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, BrazilUniv Estadual Campinas UNICAMP, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil
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Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Campinas,SP,13083-859, BrazilUniversidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Campinas,SP,13083-859, Brazil
Felez, Marissol R.
Monteiro, José Carlos B.
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Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Campinas,SP,13083-859, Brazil
Universidade Federal do Maranhão, Centro de Ciências Sociais Saúde e Tecnologia (CCSST), Imperatriz,MA,65900-410, BrazilUniversidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Campinas,SP,13083-859, Brazil
Monteiro, José Carlos B.
de Florio, Daniel Z.
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Universidade Federal do ABC, Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, São Paulo,SP,09210-580, BrazilUniversidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Campinas,SP,13083-859, Brazil
de Florio, Daniel Z.
Gandra, Flavio C.G.
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Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Campinas,SP,13083-859, BrazilUniversidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Campinas,SP,13083-859, Brazil
Gandra, Flavio C.G.
Gama, Sergio
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Universidade Federal de São Paulo, Departamento de Ciências Exatas e da Terra, Diadema,SP,09910-720, BrazilUniversidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Campinas,SP,13083-859, Brazil