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arXiv 0908.3374cond-mat.stat-mechcond-mat.str-el
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二维定域Ising自旋和巡游电子混合模型中自发反铁磁长程序的精确证据

Exact evidence for the spontaneous antiferromagnetic long-range order in the two-dimensional hybrid model of localized Ising spins and itinerant electrons

Jozef Strecka, Akinori Tanaka, Lucia Canova, Taras Verkholyak

摘要:

采用广义装饰-迭代变换精确地处理双装饰二维晶格的混合模型,该模型的Ising自旋局域在其节点晶格位置,而巡游电子在成对的装饰位置上离域.在半填充的假设下,所研究的模型系统表现出显著的自发反铁磁长程序,且交错磁化强度有明显的量子减少.结果表明,自发长程有序量子反铁磁体的临界温度与动力学项和Ising型交换作用之比具有显著的非单调关系.

英文摘要:

The generalized decoration-iteration transformation is adopted to treat exactly a hybrid model of doubly decorated two-dimensional lattices, which have localized Ising spins at their nodal lattice sites and itinerant electrons delocalized over pairs of decorating sites. Under the assumption of a half filling of each couple of the decorating sites, the investigated model system exhibits a remarkable spontaneous antiferromagnetic long-range order with an obvious quantum reduction of the staggered magnetization. It is shown that the critical temperature of the spontaneously long-range ordered quantum antiferromagnet displays an outstanding non-monotonic dependence on a ratio between the kinetic term and the Ising-type exchange interaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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