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Density matrix renormalization group studies on one-dimensional -conjugated organic ferromagnet with side radicals
Authors:KL Yao  GY Sun  WZ Wang
Institution:(1) Department of Physics and the State key Lab. of Laser Technology, Huazhong University of Science and Technology, Wuhan, 430074, PR China, CN;(2) The International Center of Materials Physics, The Chinese Academy of Science, Shengyang, 110015, PR China, CN
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 , a transition from a single soliton-like distortion to a pair of soliton-like distortions along the main chain takes place. Such critical value 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. Received 2 July 2001 and Received in final form 25 September 2001
Keywords:PACS  75  40  Mg Numerical simulation studies –  75  30  Ds Spin waves
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