Double Exchange Ferromagnetism in the Peierls Insulator State
Double Exchange Ferromagnetism in the Peierls Insulator State
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Peierls 绝缘体态的双交换铁磁性
DOI：
10.1103/physrevlett.109.076401
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
S. Nishimoto and Y. Ohta
中科院分区：
文献类型：
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作者：
Y. Ota;M. Machida and T. Koyama;S. Nishimoto and Y. Ohta
研究了带隙开放对双交换铁磁性的影响。应用密度矩阵重整化群方法和从二聚体极限到一维双交换模型的解析展开，我们证明了在交换耦合的相关区域，在弱二聚化区域，Peierls能隙在完全自旋极化的导带中打开而不影响其铁磁性，而在强二聚化区域，铁磁性被破坏，而Mott能隙打开，导致系统的反铁磁准长程有序。 <?format ?>绝缘体版本的双交换铁磁性，从而建立。
We study the effects of opening the band gap on the double exchange ferromagnetism. Applying the density-matrix renormalization group method and an analytical expansion from the dimer limit to the one-dimensional double exchange model, we demonstrate for a relevant region of the exchange coupling that, in the weak dimerization regime, the Peierls gap opens in the fully spin-polarized conduction band without affecting its ferromagnetism, whereas in the strong dimerization regime, the ferromagnetism is destroyed, and the Mott gap opens instead, leading the system to the antiferromagnetic quasi-long-range order. <?format ?>An insulator version of double exchange ferromagnetism is thus established.