Double exchange ferromagnetism in the Peierls insulator state.
作者： S. Nishimoto , Y. Ohta
DOI: 10.1103/PHYSREVLETT.109.076401
关键词: Renormalization group 、 Exchange model 、 Antiferromagnetism 、 Band gap 、 Physics 、 Ferromagnetism 、 Conduction band 、 Condensed matter physics 、 Insulator (electricity)
摘要: We study the effects of opening band gap on double exchange ferromagnetism. Applying density-matrix renormalization group method and an analytical expansion from dimer limit to one-dimensional model, we demonstrate for a relevant region coupling that, in weak dimerization regime, Peierls opens fully spin-polarized conduction without affecting its ferromagnetism, whereas strong ferromagnetism is destroyed, Mott instead, leading system antiferromagnetic quasi-long-range order. An insulator version thus established.
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