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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Unconventional critical behavior of the magnetic refrigerant system Er-0.98 & x2610;Co-0.02(2) around its ferromagnetic-paramagnetic transition
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Unconventional critical behavior of the magnetic refrigerant system Er-0.98 & x2610;Co-0.02(2) around its ferromagnetic-paramagnetic transition

机译：磁性制冷剂系统ER-0.98＆X2610的非常规关键行为; CO-0.02（2）周围其铁磁 - 顺磁化过渡

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Magnetic refrigeration is a promising energy efficient and environmentally friendly refrigeration technology. The major problem in magnetic refrigeration is to find working materials with a large magnetocaloric effect (MCE) in different temperatures regions. MCE is the reversible temperature change of a magnetic materials upon the application or removal of a magnetic field. Nanoscale magnetic materials are good candidates for magnetic refrigeration due to a presence of a large MCE in the superparamagnetic system and reduced hysteresis losses. The critical behavior of Er-0.98 & x2610;Co-0.02(2) intermetallic system has been investigated via isothermal magnetizations around its ferromagnetic-paramagnetic (FM-PM) transition at Curie temperature T-C = 62 K. This study was performed through different methods; Arrott-Noakes technique, Kouvel-Fisher analysis, and critical isotherms procedure. All these models could not explain the behavior of the studied system, which suggest that it belongs to an unconventional critical behavior. The critical exponents of the magnetization beta, for the temperature dependence of the spontaneous magnetization below Curie Temperature (T-C), and gamma for the magnetic susceptibility, and delta for the magnetic isotherm at T-C were calculated. Based on Modified Arrott plots; Er-0.98 & x2610;Co-0.02(2) gives T-C = 62.57 K 0.01 K with beta = 0.68 0.005 and T-C = 62.59 K 0.01 K with gamma = 0.88 0.008. Using Kouvel-Fisher technique, we get T-C = 62.66 K 0.06 K with beta = 0.71 0.01 and T-C = 62.54 K 0.02 K with gamma = 0.90 0.06. The extracted value of delta from the critical isotherms and the Widom scaling relation are so close confirming that the obtained critical exponents are suitable and accurate within experimental error values. With 536.45 J kg(-1) at 5 T of relative cooling power, Er-0.98 & x2610;Co-0.02(2) is very promising as magnetic refrigerant.
机译：磁制冷是一种有前途的节能和环保的制冷技术。磁制冷中的主要问题是在不同温度区域中找到具有大磁热效应（MCE）的工作材料。 MCE是磁性材料在施加或移除磁场时的可逆温度变化。纳米级磁性材料是磁制冷的良好候选者，由于超顺磁性系统中的大型MCE存在，降低滞后损失。 ER-0.98＆X2610的临界行为;通过在居里温度Tc = 62k的铁磁性顺磁（FM-PM）过渡周围的等温磁化进行了CO-0.02（2）个金属间系统。本研究通过不同的方法进行;令助落技术，Kouvel-Fisher分析和关键等温机程序。所有这些模型都无法解释所研究的系统的行为，这表明它属于非常规的关键行为。计算磁化β的临界指数，用于居里温度（T-C）以下自发磁化的温度依赖性，以及用于磁化率的磁性敏感性的γ和达-C的磁性等温线的δ。基于改进的arrott图; ER-0.98＆X2610; CO-0.02（2）给予T-C = 62.57 k 0.01k，β= 0.68.005和T-C = 62.59 k 0.01k，γ= 0.88 0.008。使用Kouvel-Fisher技术，我们得到T-C = 62.66 k 0.06 k，β= 0.71.01和T-C = 62.54 k 0.02 k，γ= 0.06 0.06。来自关键等温线的增量的提取值和WIDOM缩放关系如此接近，确认所获得的临界指数在实验误差值内是合适的和准确的。 53.45 J kg（-1）的相对冷却功率为5t，ER-0.98＆x2610; CO-0.02（2）非常有前途作为磁制冷剂。

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