Abstract The magnetocaloric properties of the J 1 – J 2 transverse Ising model are studied by the Correlated Cluster Mean Field approximation. We focus on the particular case J 1 = 1 and J 2 = - 1 . The model exhibits a complex phase diagram where three phases were identified: superantiferromagnetic, mixed and paramagnetic. The change in entropy, the cooling ratio and the adiabatic temperature were calculated; we distinguish two types of magnetocaloric effect: normal and inverse. The magnetocaloric properties of the model are discussed as a function of temperature, transverse and longitudinal fields.

中文翻译：

---

J1-J2 横向 Ising 模型中的磁热效应

摘要 通过相关聚类平均场近似研究了J 1 – J 2 横向Ising模型的磁热特性。我们关注特殊情况 J 1 = 1 和 J 2 = - 1 。该模型展示了一个复杂的相图，其中确定了三相：超反铁磁性、混合相和顺磁性。计算熵的变化、冷却比和绝热温度；我们区分两种类型的磁热效应：正常和反向。模型的磁热特性作为温度、横向和纵向场的函数进行讨论。