Heat capacity upgrade for PPMS

我们的研究工作主要集中在各种含有稀土元素的材料的结晶学和磁性上。金属间稀土化合物已经提供了世界上最强的永磁体，并将成为世界下一代制冷材料的基础。稀土元素也是高温超导体的重要组成部分。我们对稀土化合物的基本磁性感兴趣。它们的磁性结构是什么？为什么会形成这些特殊的结构？为什么当一个人改变外部参数，如温度和磁场时，它们有时会发生变化？他说，如果我们要全面了解这种具有战略重要性的材料的内在磁性行为，我们必须能够全面描述观察到的磁性行为的变化。换句话说，有多少能量与各种基本相互作用有关，这些基本相互作用决定了固有的磁性行为？热容是一个基本的热力学参数，它是化合物在经历晶体或磁结构变化时损失或获得多少能量的直接衡量标准。根据对热容与温度的关系的准确知识可以用来检测变化并了解这些变化的性质，我们计划使用热容测量，结合其他数据(磁化、穆斯堡尔谱、中子衍射……)。

Our research work focuses on the crystallographic and magnetic properties of a variety of materials incorporating the Rare Earth elements. Intermetallic Rare Earth compounds already provide the World's strongest permanent-magnets and will be the basis for the World's next generation of refrigerant materials. Rare Earth elements are also an essential component of the high-temperature superconductors. We are interested in the fundamental magnetism of Rare Earth compounds. What are their magnetic structures ? Why do these particular structures form and why do they sometimes change when one changes external parameters such as temperature and magnetic field ?     If we are to develop a comprehensive understanding of the intrinsic magnetic behaviour of such strategically important materials we must be able to characterise fully the changes observed in the magnetic behaviour. In other words, how much energy is associated with the various fundamental interactions whose complex interplay determines the intrinsic magnetic behaviour ?  Heat capacity is a fundamental thermodynamic parameter which is a direct measure of how much energy is lost or gained by a compound as it undergoes a changes in its crystal or magnetic structure.                Accurate knowledge of the temperature dependence of Heat Capacity can be used to detect changes and also understand the nature of those changes, We plan to investigate a variety of important Rare Earth compounds using Heat Capacity measurements, in conjunction with other data (magnetisation, Mossbauer spectroscopy, neutron diffraction....).