标题： 自旋-1/2$XX$链中的磁热效应与三自旋相互作用 显示英文标题

标题： Magnetocaloric effect in spin-1/2 $XX$ chains with three-spin interactions

摘要： 我们考虑在外部（横向）磁场中具有三自旋相互作用的可精确求解的自旋-1/2$XX$链，其三自旋相互作用类型为$XZX+YZY$和$XZY-YZX$类型。 我们计算了熵并研究了量子自旋系统的磁热效应。 我们讨论了冷却/加热效率与量子自旋模型基态相图之间的关系。 我们还比较了在量子临界点和三重点附近的冷却/加热能力。 此外，我们研究了自旋-1/2$XX$链在随机（洛伦兹型）横向磁场中的磁热效应。 显示英文摘要

摘要： We consider the exactly solvable spin-1/2 $XX$ chain with the three-spin interactions of the $XZX+YZY$ and $XZY-YZX$ types in an external (transverse) magnetic field. We calculate the entropy and examine the magnetocaloric effect for the quantum spin system. We discuss a relation between the cooling/heating efficiency and the ground-state phase diagram of the quantum spin model. We also compare ability to cool/heat in the vicinity of the quantum critical and triple points. Moreover, we examine the magnetocaloric effect for the spin-1/2 $XX$ chain with three-spin interactions in a random (Lorentzian) transverse magnetic field.