arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1401.7644cond-mat.str-el
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交换模型中的自旋极化子

Spin-polarons in an exchange model

O. Navarro, E. Vallejo, M. Avignon

摘要:

自旋极化子是用类伊辛交换模型得到的,该模型由低维系统中的双交换和超交换相互作用组成。在零温度下,一个新的相分离之间的小磁极化子,一个导电电子自陷在一个磁畴的两个或三个网站,和反铁磁相以前的报告。另一方面,忽略了温度的重要影响。温度减小了系统中允许激发态的玻尔兹曼概率。计算了零磁场下的静态磁化率和短程自旋-自旋关联,探讨了自旋-极化子的形成。在高温下的Curie-Weiss行为,并与在镍酸盐一维化合物中观察到的类Curie行为进行了比较。

英文摘要:

Spin-polarons are obtained using an Ising-like exchange model consisting of double and super-exchange interactions in low dimensional systems. At zero temperature, a new phase separation between small magnetic polarons, one conduction electron self-trapped in a magnetic domain of two or three sites, and the anti-ferromagnetic phase was previously reported. On the other hand the important effect of temperature was missed. Temperature diminishes Boltzmann probability allowing excited states in the system. Static magnetic susceptibility and short-range spin-spin correlations at zero magnetic field were calculated to explore the spin-polaron formation. At high temperature Curie-Weiss behavior is obtained and compared with the Curie-like behavior observed in a nickelate one-dimensional compound.

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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