Ferrimagnetism and metal–insulator transition in an organic polymer chain

doi:10.1088/1674-1056/23/2/027502

中国物理B ›› 2014, Vol. 23 ›› Issue (2): 27502-027502.doi: 10.1088/1674-1056/23/2/027502

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Ferrimagnetism and metal–insulator transition in an organic polymer chain

丁林杰, 钟园, 樊帅伟

Department of Physics, China Three Gorges University, Yichang 443002, China

收稿日期:2013-04-29 修回日期:2013-06-08 出版日期:2013-12-12 发布日期:2013-12-12
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11204157 and 11174179), the China Three Gorges University Project (Grant No. KJ2011B068), and the Yichang City Project, China (Grant No. A201230229).

Ferrimagnetism and metal–insulator transition in an organic polymer chain

Ding Lin-Jie (丁林杰), Zhong Yuan (钟园), Fan Shuai-Wei (樊帅伟)

Department of Physics, China Three Gorges University, Yichang 443002, China

Received:2013-04-29 Revised:2013-06-08 Online:2013-12-12 Published:2013-12-12
Contact: Ding Lin-Jie E-mail:dinglinjie82@126.com
About author:75.50.Gg; 73.43.Nq; 75.40.Cx
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11204157 and 11174179), the China Three Gorges University Project (Grant No. KJ2011B068), and the Yichang City Project, China (Grant No. A201230229).

摘要/Abstract

摘要： The ferrimagnetism and quantum phase transition of a bipartite lozenge periodic Anderson-like organic polymer, in which the localized f electrons hybridize with the odd site conduction orbitals, are investigated by means of Green’s function theory. The ground state turns out to be gapless ferrimagnetism. At a finite temperature, the ferrimagnetic-to-paramagnetic phase transition takes place. The Kondo screenings and Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction can reduce and increase the transition temperature, respectively. Two Kondo screenings compete with each other, giving rise to the localized f electron spin screened antiferromagnetically. Accordingly, in a magnetic field, all spins are aligned along the chain easily, which is associated with metal–insulator transition. Furthermore, in a temperature-field plane, we reveal the gapless and spin polarized phases, which are characterized by susceptibility and specific heat, and whose behaviours are determined by the competition between the up-spin and down-spin hole excitations.

关键词: ferrimagnetism, quantum phase transition, organic polymer

Abstract: The ferrimagnetism and quantum phase transition of a bipartite lozenge periodic Anderson-like organic polymer, in which the localized f electrons hybridize with the odd site conduction orbitals, are investigated by means of Green’s function theory. The ground state turns out to be gapless ferrimagnetism. At a finite temperature, the ferrimagnetic-to-paramagnetic phase transition takes place. The Kondo screenings and Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction can reduce and increase the transition temperature, respectively. Two Kondo screenings compete with each other, giving rise to the localized f electron spin screened antiferromagnetically. Accordingly, in a magnetic field, all spins are aligned along the chain easily, which is associated with metal–insulator transition. Furthermore, in a temperature-field plane, we reveal the gapless and spin polarized phases, which are characterized by susceptibility and specific heat, and whose behaviours are determined by the competition between the up-spin and down-spin hole excitations.

Key words: ferrimagnetism, quantum phase transition, organic polymer

中图分类号: (Ferrimagnetics)

75.50.Gg

73.43.Nq (Quantum phase transitions) 75.40.Cx (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))

丁林杰, 钟园, 樊帅伟. Ferrimagnetism and metal–insulator transition in an organic polymer chain[J]. 中国物理B, 2014, 23(2): 27502-027502.

Ding Lin-Jie (丁林杰), Zhong Yuan (钟园), Fan Shuai-Wei (樊帅伟). Ferrimagnetism and metal–insulator transition in an organic polymer chain[J]. Chin. Phys. B, 2014, 23(2): 27502-027502.

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Ferrimagnetism and metal–insulator transition in an organic polymer chain

Ferrimagnetism and metal–insulator transition in an organic polymer chain

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