A universal curve for the magnetocaloric effect:: an analysis based on scaling relations
A universal curve for the magnetocaloric effect:: an analysis based on scaling relations
复制标题
DOI：
10.1088/0953-8984/20/28/285207
复制
发表时间：
2008-07-16
影响因子：
2.7
通讯作者：
Blazquez, J. S.
中科院分区：
文献类型：
--
作者：
Franco, V.;Conde, A.;Blazquez, J. S.
最近的实验发现的主曲线的磁熵变，Δ S-M，在材料的磁热响应的研究中的通用字符是通过使用标度参数分析证明。对实验数据以及平均场和海森堡模型的标度关系的有效性进行了检查。曲线对于每个普适性类都是唯一的。它示出的通用曲线可以实际上以两种不同的方式构建，减少所需的参数的数量相对于以前的唯象推导。这开启了磁热材料性能的廉价筛选的可能性，因为它允许外推到一些实验室中不可用的磁场或温度。
The universal character of the recent experimentally found master curve for the magnetic entropy change, Delta S-M, in studies of the magnetocaloric response of materials is analytically justified by using scaling arguments. The validity of the obtained scaling relations is checked against experimental data as well as the mean field and Heisenberg models. The curves are unique for each universality class. It is shown that the universal curve can be practically constructed in two different ways, reducing the number of required parameters with respect to the previous phenomenological derivation. This opens the possibility of an inexpensive screening of the performance of magnetocaloric materials, as it allows extrapolations to magnetic fields or temperatures not available in some laboratories.