Comparative studies of magnetocaloric effect and magnetotransport behavior in GdRu2Si2 compound
Comparative studies of magnetocaloric effect and magnetotransport behavior in GdRu2Si2 compound
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DOI：
10.1063/1.3043558
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发表时间：
2008-12-15
影响因子：
3.2
通讯作者：
Banerjee, S.
中科院分区：
文献类型：
--
作者：
Samanta, Tapas;Das, I.;Banerjee, S.
对多晶 GdRu2Si2 进行了磁热效应（磁熵 Delta S 的变化）和磁输运（由于磁场 Delta rho 引起的电阻率差异）的研究。由于在反铁磁转变温度（类似于 45 K）以下存在多个场诱导的变磁转变和超区能隙效应，该系统表现出复杂的磁输运行为。通过对 Delta rho 和 Delta S 的比较研究，分析了这种复杂的磁输运行为。通过显示 Delta S 和 Delta rho 变化的差异，突出了 Delta rho 的异常区域，该区域不受磁矩方向变化的支配。讨论了 Delta S 和 Delta rho 在不同温度和磁场区域的相似和不同行为的起源。 Delta S 和 Delta rho 的比较研究表明，它是理解磁性材料复杂磁输运行为的强大技术。有趣的是，通过磁化、磁输运或磁热数据生成的 GdRu2Si2 复杂的磁相图似乎是相同的，这表明这些物理量在生成磁相图方面很有用。
Studies on magnetocaloric effect (change in magnetic entropy Delta S) and magnetotransport (difference in resistivity due to magnetic field Delta rho) have been performed on polycrystalline GdRu2Si2. Due to the presence of several field-induced metamagnetic transitions and superzone energy gap effect below the antiferromagnetic transition temperature (similar to 45 K), the system exhibits complex magnetotransport behavior. Such a complicated magnetotransport behavior has been analyzed by the comparative studies on Delta rho and Delta S. The anomalous regions of Delta rho, where it is not dominated by the change in the orientation of magnetic moments, have been highlighted by showing the difference in the variation in Delta S and Delta rho. The origin of similar and dissimilar behaviors of Delta S and Delta rho at different regions of temperature and magnetic field has been discussed. The comparative study of Delta S and Delta rho indicates that it is a powerful technique to understand the complex magnetotransport behavior of the magnetic materials. Interestingly, the intricate magnetic phase diagram of GdRu2Si2 generated by taking magnetization, magnetotransport, or magnetocaloric data appeared to be identical, indicating the usefulness of these physical quantities to generate magnetic phase diagram.