Entropy change and magnetocaloric effect in Gd5(SixGe1-x)4
Entropy change and magnetocaloric effect in Gd5(SixGe1-x)4
复制标题
DOI：
10.1103/physrevb.66.100401
复制
发表时间：
2002-09
影响因子：
3.7
通讯作者：
F. Casanova;X. Batlle;A. Labarta;J. Marcos;L. Mañosa;A. Planes
中科院分区：
文献类型：
--
作者：
F. Casanova;X. Batlle;A. Labarta;J. Marcos;L. Mañosa;A. Planes
在Gd5Si1中测量了高达23T的等温磁化曲线。8个GE 2。2.结果表明，从Clausius-Clapeyron方程和Maxwell关系得到的一阶磁结构相变的熵变值是一致的，只要麦克斯韦关系只在过渡区内计算，并且最大外加磁场足够高来完成相变。这些值也与差示扫描量热法得到的熵变一致。我们还表明，一个基于磁化强度与温度和场关系的简单唯象模型解释了这些结果。
Isothermal magnetization curves up to 23 T have been measured in Gd 5 Si 1 . 8 Ge 2 . 2 . We show that the values of the entropy change at the first-order magnetostructural transition, obtained from the Clausius-Clapeyron equation and the Maxwell relation, are coincident, provided the Maxwell relation is evaluated only within the transition region and the maximum applied field is high enough to complete the transition. These values are also in agreement with the entropy change obtained from differential scanning calorimetry. We also show that a simple phenomenological model based on the temperature and field dependence of the magnetization accounts for these results.