Spin density wave in oxypnictide superconductors in a three-band model |
| |
Authors: | M S Long L B Hu and W LiMing |
| |
Institution: | 1.Dept. of Physics, and Institute for Condensed Matter Physics, School of
Physics and Telecommunication Engineering, South China Normal University,Guangzhou,P.R. China |
| |
Abstract: | The spin density wave and its temperature dependence in oxypnictide are studied in a
three-band model. The spin susceptibilities with various interactions are calculated in
the random phase approximation (PPA). It is found that the spin susceptibility peaks
around the M point show a spin density wave (SDW) with momentum (0, π) and a clear
stripe-like spin configuration. The intra-band Coulomb repulsion enhances remarkably the
SDW but the Hund’s coupling weakens it. It is shown that a new resonance appears at
higher temperatures at the Γ point indicating the formation of a paramagnetic
phase. There is a clear transition from the SDW phase to the paramagnetic phase. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|