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arXiv 0811.1293cond-mat.str-el
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几乎半满哈伯德模型和窄带{ \it S-f}模型的有效自旋哈密顿量和相分离不稳定性

The Effective Spin Hamiltonian and Phase Separation Instability of the Almost Half-Filled Hubbard Model and Narrow-Band {\it S-f} Model

M. I. Auslender, M. I. Katsnelson

摘要:

本文在Cayley树上的几乎半满哈伯德模型的框架下,利用泛函积分技术和静态近似,构造了有效自旋哈密顿量。在基态,只要过剩电子(或空穴)浓度不超过某一临界值,系统似乎由铁磁金属畴和反铁磁绝缘畴组成。阐述了哈伯德模型与{ \it s-f}模型之间的联系。添加注释:这篇文章旨在表明,强关联电子系统中的相分离在20世纪70 -80年代就已经被考虑过,而不是最近锰氧化物热潮的发现

英文摘要:

The effective spin Hamiltonian is constructed in the framework of the almost half-filled Hubbard model on the Cayley tree by means of functional integral technique with the use of static approximation. The system in the ground state appears to be consisting of the ferromagnetic metallic domains and the antiferromagnetic insulating one sprovided that the concentration of excess electrons (or holes) does not exceed some critical value. The connection between the Hubbard model and the {\it s-f} model is stated. Note added: This posting is intended to show that the phase separation in strongly correlated electronic systems was considered already in 1970-80's and is not a discovery of latest manganites boom

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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