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arXiv 0912.0992cond-mat.str-elcond-mat.stat-mech
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二维哈伯德模型中最近邻和次最近邻跃迁的无公度磁序和相分离

Incommensurate magnetic order and phase separation in the two-dimensional Hubbard model with nearest and next-nearest neighbor hopping

P. A. Igoshev, M. A. Timirgazin, A. A. Katanin, A. K. Arzhnikov, V. Yu. Irkhin

摘要:

考虑了具有最近邻和次最近邻跃迁的二维哈伯德模型的基态磁相图。我们治疗相称的铁和反铁磁,以及无公度(螺旋)磁相。在铁磁相、反铁磁相和螺旋磁相之间发现了一级磁相变,其化学势变化导致密度上的相分离。我们认为,帐户的PS有一个戏剧性的影响,在半填充附近的相图。这些结果可能解释了单层铜氧化物在共线和螺旋磁相之间的PS方面的磁性能的异常行为。本文还讨论了所得结果与磁性能的关系。

英文摘要:

We consider the ground state magnetic phase diagram of the two-dimensional Hubbard model with nearest and next-nearest neighbor hopping in terms of electronic density and interaction. We treat commensurate ferro- and antiferromagnetic, as well as incommensurate (spiral) magnetic phases. The first-order magnetic transitions with changing chemical potential, resulting in a phase separation (PS) in terms of density, are found between ferromagnetic, antiferromagnetic and spiral magnetic phases. We argue that the account of PS has a dramatic influence on the phase diagram in the vicinity of half-filling. The results imply possible interpretation of the unusual behavior of magnetic properties of one-layer cuprates in terms of PS between collinear and spiral magnetic phases. The relation of the results obtained to the magnetic properties of ruthenates is also discussed.

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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