Room temperature critical behavior and magnetocaloric properties of La_0.6Nd_0.1(CaSr)_0.3Mn_0.9V_0.1O₃

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• 作者：A. Dhahri ; F.I.H. Rhouma ; S. Mnefgui ; J. Dhahri ; E.K. Hlil
• 关键词：Manganites ; Magnetocaloric effect ; Relative cooling power ; Critical exposents
• 刊名：Ceramics International
• 出版年：January, 2014
• 年：2014
• 卷：40
• 期：1_part_PA
• 页码：459-464
• 全文大小：773 K

文摘

The magnetocaloric effect along magnetic phase transition and critical exponent in mixed manganite La_0.6Nd_0.1(CaSr)_0.3Mn_0.9O₃ was investigated by dc magnetization measurements. Magnetic data indicate that the compound exhibit a continuous (second-order) paramagnetic (PM) to ferromagnetic (FM) phase transition. From the derived values of the critical exponents (<em>尾em>=0.385(1) and <em>纬em>=1.481(3)), we conclude that La_0.6Nd_0.1(CaSr)_0.3Mn_0.9V_0.1O₃ belongs to the three-dimensional Heisenberg class with short-range interaction. The maximum magnetic entropy (鈭捨?em>Sem>_M) and the relative cooling power (RCP) were found to be respectively, 4.266 J/kg K and 205.35 J/kg for a 5 T field change, making of this material a promising candidate for magnetic refrigeration near room temperature. From the field dependence of RCP and 螖<em>Sem>_M, it was possible to evaluate the critical exponents of the magnetic phase transitions. Their values are in good agreement with those obtained from the critical exponents using a modified Arrott method.