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arXiv 0810.1672cond-mat.str-el
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具有Jahn-Teller畸变的类锰氧化物局域矩系统的磁Phase Diagrams

Magnetic Phase Diagrams of Manganites-like Local-Moment Systems with Jahn-Teller distortions

M. Stier, W. Nolting

摘要:

我们使用一个扩展的双带Kondo晶格模型(KLM)来研究不同的(反)铁磁相或相分离的发生取决于几个模型参数。关于CMR材料,如锰氧化物,我们增加了一个Jahn-Teller项,直接反铁磁耦合和库仑相互作用的KLM。电子性质的自洽计算的插值自能方法,没有限制经典的自旋和超越平均场处理。进一步说,我们不必将猎犬的耦合限制为较低或无限大的值。零温相图大参数区间。库仑相互作用的类型(带内,带间)和重要参数(洪德耦合,直接反铁磁交换,Jahn-Teller失真),特别是在中间耦合有很大的影响。

英文摘要:

We use an extended two-band Kondo lattice model (KLM) to investigate the occurrence of different (anti-)ferromagnetic phases or phase separation depending on several model parameters. With regard to CMR-materials like the manganites we have added a Jahn-Teller term, direct antiferromagnetic coupling and Coulomb interaction to the KLM. The electronic properties are self-consistently calculated in an interpolating self-energy approach with no restriction to classical spins and going beyond mean-field treatments. Further on we do not have to limit the Hund's coupling to low or infinite values. Zero-temperature phase diagrams are presented for large parameter intervals. There are strong influences of the type of Coulomb interaction (intraband, interband) and of the important parameters (Hund's coupling, direct antiferromagnetic exchange, Jahn-Teller distortion), especially at intermediate couplings.

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