反钙钛矿Mn3AX化合物由于具有巨磁阻、磁致伸缩、近零热膨胀等丰富的物性，近年来引起学术界的广泛关注，然而关于其压热、磁热效应的研究并不多。该课题旨在探讨该类化合物由等静压/外磁场引起的热效应及其机理，以期探索新型固态致冷材料。我们将通过中子衍射技术解析该类化合物在不同条件下（温度、磁场、压力）磁结构及其演化，通过元素掺杂和替代，设计和寻找对压力和磁场敏感、且存在于室温附近的特殊自旋磁结构(磁失措、自旋玻璃态、自旋涨落、混合磁相、特殊反铁磁相等)。对处于亚稳状态的磁相施加很小的压力或磁场，将会诱发明显的磁相变，进而产生较大的磁熵变。由于反钙钛矿化合物中“晶格-自旋-电荷”的强关联性，磁相变还极有可能引发明显的晶格组态熵和电子熵。基于此，我们期望最终获得在室温附近显著的压热和磁热效应，为开发先进固态致冷材料开辟新的研究领域。

In recent years, antiperovskite Mn3AX(X=N or C, A=Cu, Zn, Ga, Ni, etc.) compounds have attracted lots of attention due to the discovery of giant magnetoresistance, magnetostriction, near zero thermal expansion, and so on. However, research on the barocaloric effect or magnetocaloric is rare. This study aims to study thermal effect (barocaloric effect and magnetocaloric effect) and its mechanism of antiperovskite Mn3AX compounds induced by the application of hydrostatic field or magnetic field, and hope to explore new solid refrigerant materials and devices. We will resolve magnetic structure of antiperovskite compounds and its evolution under different temperature, magnetic field and pressure. By element doping and substitution, we try to design and find particular magnetic structure at room temperature which is sensitive to pressure or magnetic field, such as magnetic frustration, spin glass, spin fluctuations, coexisting magnetic phases, special antiferromagnetic phase, and so on. Applying small pressure or magnetic field on the metastable magnetic order phase will induce obvious magnetic transition, and then result in large magnetic entropy change. Simultaneously, the close relation among lattice, spin and charge will also induce significant lattice entropy and electronic entropy. Based on it, we hope to obtain large barocaloric effect and magnetocaloric effect around room temperature. This study will open up new research field for the development of low-cost solid-state magnetic refrigeration materials.