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Chin. Phys. B, 2014, Vol. 23(2): 027502    DOI: 10.1088/1674-1056/23/2/027502

Ferrimagnetism and metal–insulator transition in an organic polymer chain

Ding Lin-Jie, Zhong Yuan, Fan Shuai-Wei
Department of Physics, China Three Gorges University, Yichang 443002, China
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.
Keywords:  ferrimagnetism      quantum phase transition      organic polymer     
Received:  29 April 2013      Published:  12 December 2013
PACS:  75.50.Gg (Ferrimagnetics)  
  73.43.Nq (Quantum phase transitions)  
  75.40.Cx (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))  
Fund: 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).
Corresponding Authors:  Ding Lin-Jie     E-mail:
About author:  75.50.Gg; 73.43.Nq; 75.40.Cx

Cite this article: 

Ding Lin-Jie, Zhong Yuan, Fan Shuai-Wei Ferrimagnetism and metal–insulator transition in an organic polymer chain 2014 Chin. Phys. B 23 027502

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