This report deals with the finding of unusually large adiabatic temperature change ($\Delta T_{ad}$) parameter related to the magnetocaloric properties of the intermetallic compound ErIr${}_3$. The maximum isothermal magnetic entropy change ($|\Delta S_M|$) and maximum adiabatic temperature change ($\Delta T_{ad}$) are 12 J.kg${}^{-1}$.K${}^{-1}$ and 14.9 K, respectively, at a field change of 0 $\to$ 70 kOe near 5.5 K. Additionally, the system does not exhibit any thermal and field hysterias loss. The high values of the said parameters (in the vicinity of helium liquification temperature) indicate that ErIr${}_3$ can be used as a greener alternative to compressor-based He liquification technology. During analysing the origin of such high values of magnetocaloric parameters, we found a mathematical correlation between the magnetocaloric parameters and the critical exponents of the phase transition. The proposed correlation may narrow the focus of the researchers engaged in searching a material with a potential to show a good magnetocaloric merit.

本报告涉及异常大绝热温度变化的发现（$\Delta {吨}_{\mathrm{一种}d}$) 与金属间化合物 ErIr 的磁热特性有关的参数${}_3$. 最大等温磁熵变（$|\Delta {秒}_{米}|$) 和最大绝热温度变化 ($\Delta {吨}_{\mathrm{一种}d}$) 是 12 J.kg${}^{-1}$.K${}^{-1}$ 和 14.9 K，分别在场变化为 0 $\to$70 kOe 接近 5.5 K。此外，该系统没有表现出任何热和场歇斯底里损失。所述参数的高值（在氦液化温度附近）表明 ErIr${}_3$可用作基于压缩机的 He 液化技术的更环保替代方案。在分析如此高磁热参数值的起源期间，我们发现了磁热参数与相变临界指数之间的数学相关性。所提出的相关性可能会缩小研究人员寻找具有良好磁热价值潜力的材料的关注范围。