Eur. Phys. J. B 14, 411-417 (2000)
https://doi.org/10.1007/s100510051048

Random phase approximation of the spin-wave excitation for quasi-one-dimensional magnetic polymer

¹ Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, P.R. China
² International Center of Material Physics, Academy of Science, Shenyang 110015, P.R. China
³ CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China

Received: 9 July 1999
Published online: 15 April 2000

Abstract

Based on a theoretical model proposed for quasi-one-dimensional organic polymer ferromagnets, the ground state and low-lying magnetic excitation are studied. Within Hartree-Fock approximation, the ground state of the system is shown to be a stable ferromagnetic state due to the electron-electron correlation and topological structure of the system. The random-phase approximation is employed to explore the magnon excitation and the excitation spectrum is obtained, including an acoustic mode and four optical modes. It is found that the acoustic mode possesses the characteristic of the ferromagnetic magnon.