Eur. Phys. J. B 24, 309-313 (2001)
https://doi.org/10.1007/s10051-001-8679-0

Density matrix renormalization group studies on one-dimensional π-conjugated organic ferromagnet with side radicals

¹ Department of Physics and the State key Lab. of Laser Technology, Huazhong University of Science and Technology, Wuhan, 430074, PR China
² The International Center of Materials Physics, The Chinese Academy of Science, Shengyang, 110015, PR China

Corresponding author: ^a klyao@hust.edu.cn

Received: 2 July 2001
Revised: 25 September 2001
Published online: 15 December 2001

Abstract

By using the density matrix renormalization group (DMRG) and the self-consistent numerical method, we obtain a high spin ground state with localized spin density describing spin localization and the soliton describing the distortion of the lattice configurations along the main chain. Different electron-phonon interactions result in different configurations of solitons. When the electron-phonon coupling along the main chain is larger than a critical value λc, a transition from a single soliton-like distortion to a pair of soliton-like distortions along the main chain takes place. Such critical value λc depends mainly on the intersite Coulomb interactions. The spin density wave along the main chain is always localized around the center of soliton-like distortions.