The multicaloric properties of multiferroic A₂Cu₂Mo₃O₁₂ (A = Rb and Cs) compounds are theoretically investigated through a frustrated one-dimensional spin ribbon chain of CuO₂. The system submitted to external magnetic and electric field constraints grants the particular interest of metamagnetoelectric effect arising at relatively low temperatures. The isentropes of Rb₂Cu₂Mo₃O₁₂ and Cs₂Cu₂Mo₃O₁₂ exhibit about four major sharper dips by lowering temperature. This highlights four meta-transitions points which in turn are simultaneously metamagnetic and metaelectric, and therefore conveniently treated as metamagnetoelectric transitions. In the vicinities of the metamagnetoelectric transitions and in the quantum critical region, the thermal entropies are relatively large, which thus results in metamagnetoelectric transitions-enhanced multicaloric effect. Furthermore, this enhancement appears in the cooling process where the adiabatic magnetic and electric cooling rates diverge in the vicinity of the metamagnetoelectric transition points indicating the prominent low-temperature multicaloric effect. It is then certain that by making use of such large magnetoelectric coupling at metamagnetoelectric transition regions, the refrigerating efficiency of multiferroic materials will be further improved.

通过挫折的一维CuO ₂一维自旋带状链，从理论上研究了多铁性A ₂ Cu ₂ Mo ₃ O ₁₂（A = Rb和Cs）化合物的多热性能。受到外部磁场和电场约束的系统赋予了在相对较低的温度下产生的超磁电效应的特殊利益。Rb ₂ Cu ₂ Mo ₃ O ₁₂和Cs ₂ Cu ₂ Mo ₃ O ₁₂的等熵通过降低温度表现出大约四个主要的急剧下降。这突出了四个亚变迁点，它们又同时是超磁的和亚电的，因此可以方便地视为超磁电的转变。在超磁电跃迁附近以及在量子临界区域，热熵相对较大，因此导致超磁电跃迁增强了多热效应。此外，这种增强作用出现在冷却过程中，其中绝热的磁和电的冷却速率在超磁电转变点附近发散，这表明了明显的低温多热效应。那么可以肯定的是，通过在超磁电过渡区域使用如此大的磁电耦合，