Abstract Availability of a restricted heat capacity data range has a clear influence on the accuracy of calculated magnetocaloric effect, as confirmed by both numerical simulations and experimental measurements. Simulations using the Bean-Rodbell model show that, in general, the approximated magnetocaloric effect curves calculated using a linear extrapolation of the data starting from a selected temperature point down to zero kelvin deviate in a non-monotonic way from those correctly calculated by fully integrating the data from near zero temperatures. However, we discovered that a particular temperature range exists where the approximated magnetocaloric calculation provides the same result as the fully integrated one. These specific truncated intervals exist for both first and second order phase transitions and are the same for the adiabatic temperature change and magnetic entropy change curves. The effect of this truncated integration in real samples was confirmed using heat capacity data of Gd metal and Gd5Si2Ge2 compound measured from near zero temperatures.

中文翻译：

---

量热测量起始温度对磁热效应测定精度的影响

摘要 数值模拟和实验测量都证实，受限热容数据范围的可用性对计算磁热效应的准确性有明显影响。使用 Bean-Rodbell 模型的模拟表明，一般而言，使用从选定温度点开始到零开尔文的数据的线性外推法计算的近似磁热效应曲线与通过完全积分正确计算的那些以非单调方式偏离来自接近零温度的数据。然而，我们发现存在一个特定的温度范围，其中近似磁热计算提供与完全集成计算相同的结果。这些特定的截断区间对于一阶和二阶相变都存在，并且对于绝热温度变化和磁熵变化曲线是相同的。使用从接近零温度测量的 Gd 金属和 Gd5Si2Ge2 化合物的热容量数据证实了这种截断积分在实际样品中的影响。